Pennock's Fiero Forum
  Technical Discussion & Questions - Archive
  Crank Pulley

T H I S   I S   A N   A R C H I V E D   T O P I C
  

Email This Page to Someone! | Printable Version


Crank Pulley by rjblaze
Started on: 01-29-2008 11:30 PM
Replies: 26
Last post by: bnevets27 on 03-15-2008 02:28 PM
rjblaze
Member
Posts: 1157
From: Bethlehem, Pa., United States
Registered: May 2006


Feedback score:    (19)
Leave feedback

Rate this member

Report this Post01-29-2008 11:30 PM Click Here to See the Profile for rjblazeClick Here to Email rjblazeSend a Private Message to rjblazeDirect Link to This Post
Can someone tell me if there is a difference between the FWD crank pulley and the RWD crank pulley. I understand that our 2.8's are externally balanced, but I also understand that the flywheel/flexplate is where the balancing takes place. I am trying to convert my stock 2.8 to DIS and several of the other mods associated with the 7730 ecm swap. I want to get this all working fine while I build my (3.4, 3400,3500...decisions, decisions). The only crank trigger I have found for a reasonable price only works on the FWD crank pulleys. Can they be interchanged? Am I up the proverbial creek without a paddle? Should I sign myself in to the place with the rubber-walled rooms? HELP
IP: Logged
PFF
System Bot
Steven Snyder
Member
Posts: 3311
From: Los Angeles, CA
Registered: Mar 2004


Feedback score: (2)
Leave feedback





Total ratings: 106
Rate this member

Report this Post01-29-2008 11:47 PM Click Here to See the Profile for Steven SnyderClick Here to visit Steven Snyder's HomePageClick Here to Email Steven SnyderSend a Private Message to Steven SnyderDirect Link to This Post
The harmonic balancers are all neutrally balanced. However, some of them have a 3-bolt pattern for the crank pulley and others 4-bolt.. so you may not be able to get a properly spaced pulley for the one you get. I wish I could help you further than that..
IP: Logged
Hudini
Member
Posts: 7956
From: Shanghai, China
Registered: Feb 2006


Feedback score: N/A
Leave feedback





Total ratings: 158
Rate this member

Report this Post01-29-2008 11:54 PM Click Here to See the Profile for HudiniClick Here to Email HudiniSend a Private Message to HudiniDirect Link to This Post
If it wasn't raining cats and dogs I'd go look. I have both RWD and FWD 2.8L engines.

Correct me if I'm wrong but isn't the Fiero engine the same layout as the FWD engines? The starter is on the FWD side, etc.

[This message has been edited by Hudini (edited 01-29-2008).]

IP: Logged
rjblaze
Member
Posts: 1157
From: Bethlehem, Pa., United States
Registered: May 2006


Feedback score:    (19)
Leave feedback

Rate this member

Report this Post01-30-2008 05:45 AM Click Here to See the Profile for rjblazeClick Here to Email rjblazeSend a Private Message to rjblazeDirect Link to This Post
That's what I thought. I don't understand what the difference could be (the crank trigger attaches using the center pulley bolt) unless it is an offset issue.
IP: Logged
JazzMan
Member
Posts: 18612
From:
Registered: Mar 2003


Feedback score:    (7)
Leave feedback





Total ratings: 653
User Banned

Report this Post01-30-2008 01:21 PM Click Here to See the Profile for JazzManClick Here to Email JazzManSend a Private Message to JazzManDirect Link to This Post
How is the trigger indexed? The front wheel drive and rear wheel drive cranks are indexed the same but the dampener has the timing mark groove on the other side because in front wheel drive cars the mark is viewed from what would be the passenger compartment of the Fiero. It seems that the indexing is most important than how you get there.

JazzMan
IP: Logged
rjblaze
Member
Posts: 1157
From: Bethlehem, Pa., United States
Registered: May 2006


Feedback score:    (19)
Leave feedback

Rate this member

Report this Post01-30-2008 02:18 PM Click Here to See the Profile for rjblazeClick Here to Email rjblazeSend a Private Message to rjblazeDirect Link to This Post
It is hard to tell that from this site:

http://www.tcemotorsports.com/

I will have to ask these people. It appears that there is one set of "notches" that is doubled as apposed to the other single "notches". I will also try asking on the 60* V6 site because I believe there are people that have used these.
IP: Logged
rjblaze
Member
Posts: 1157
From: Bethlehem, Pa., United States
Registered: May 2006


Feedback score:    (19)
Leave feedback

Rate this member

Report this Post02-04-2008 11:10 AM Click Here to See the Profile for rjblazeClick Here to Email rjblazeSend a Private Message to rjblazeDirect Link to This Post
Anyone else with more information?
IP: Logged
Pyrthian
Member
Posts: 29541
From: Detroit, MI
Registered: Jul 2002


Feedback score: (5)
Leave feedback





Total ratings: 341
Rate this member

Report this Post02-04-2008 11:34 AM Click Here to See the Profile for PyrthianClick Here to Email PyrthianSend a Private Message to PyrthianDirect Link to This Post
are you doing this with an old 2.8 crank & block?

the DIS module expects a 7 pulse trigger - 6 being 60* apart, and 1 being 10* off of TDC #1
I dunno what the FWD crank trigger is setup as - but I think it has many more triggers. this is usualy the high resolution trigger, and is used for SPFI, not the DIS.

and, next - I dont see why the pulley matters - I expect you can use either one.

but - what you are looking for is: a metal ring/collar, which has 7 holes in it, 6 equally spaced, and 1 spaced real close to another one. this ring will fit on the crank pulley, held aligned by the key on the crank, so that the 2 close together holes line up, so they are lined up with the pickup @ TDC #1 & 10 degrees BTDC
IP: Logged
rjblaze
Member
Posts: 1157
From: Bethlehem, Pa., United States
Registered: May 2006


Feedback score:    (19)
Leave feedback

Rate this member

Report this Post02-04-2008 02:44 PM Click Here to See the Profile for rjblazeClick Here to Email rjblazeSend a Private Message to rjblazeDirect Link to This Post
Yes, I am planning (in the beginning anyway) to use my original 2.8 to get everything up and running with my 7730 ecm swap. This will give me time to really "build" my 3.4 the way I want (like the road-course small blocks I used to build for our local racers). Did you look at the link I posted above? The trigger they sell looks exactly like you described, but appears to mount in front of the damper (what they are calling a pulley) and behind the crank pulley. I am hoping for a rely from them soon, this might help out others that want to convert their 2.8's to DIS and the 7730 ecm.

The only thing I can see from the site is that the damper / serp. crank pulley is all together and we have an extra pulley (V-belt) on the front to drive the A/C? Gosh, I can't remember if we do or not....I just had a brain fart!

[This message has been edited by rjblaze (edited 02-04-2008).]

IP: Logged
Pyrthian
Member
Posts: 29541
From: Detroit, MI
Registered: Jul 2002


Feedback score: (5)
Leave feedback





Total ratings: 341
Rate this member

Report this Post02-04-2008 03:04 PM Click Here to See the Profile for PyrthianClick Here to Email PyrthianSend a Private Message to PyrthianDirect Link to This Post
yeah - that looks like it will work just fine.

ideally, you'd want it "keyed" on the crank - but - this pushes everything else forward, and un-aligns your belts.
probably the easiest thing would be to mount it last - like that first pic on that site. the most important part is to align the pickup at TDC#1.

it also looks like they use a dowel/dummy shaft to carry the key forward - maybe they can make one to a custom length for you, with an extra long crank bolt.
IP: Logged
rjblaze
Member
Posts: 1157
From: Bethlehem, Pa., United States
Registered: May 2006


Feedback score:    (19)
Leave feedback

Rate this member

Report this Post02-05-2008 01:44 PM Click Here to See the Profile for rjblazeClick Here to Email rjblazeSend a Private Message to rjblazeDirect Link to This Post
The guy sent me pics comparing the FWD / RWD pulley setup. It appears that since our crank pulley bolts to the front of the damper and the FWD crank pulley / damper are one unit (serp belt rides on damper), that we cannot use this current arrangement.

Do you think a FWD damper (steps inn) could be swapped onto our 2.8's and this trigger be sandwiched between our pulley and the damper? Our damper appears to stick out too far (steps out) to allow this in our normal arrangement.

Does anyone have good pics of our lower pulley (or entire front drive) arrangement?

[This message has been edited by rjblaze (edited 02-05-2008).]

IP: Logged
PFF
System Bot
Pyrthian
Member
Posts: 29541
From: Detroit, MI
Registered: Jul 2002


Feedback score: (5)
Leave feedback





Total ratings: 341
Rate this member

Report this Post02-05-2008 02:15 PM Click Here to See the Profile for PyrthianClick Here to Email PyrthianSend a Private Message to PyrthianDirect Link to This Post
not sure. I expect either dampner is neutrally balanced, so that wont matter.
you wont need timing marks anymore, so that wont matter.
sounds like a "yes". just keep your belt pulleys aligned.

maybe, just go stock, sandwhich it, and then add a spacer on the waterpump pulley & alt pulley of the same thickness.
IP: Logged
Hurricane
Member
Posts: 451
From: St Louis
Registered: Dec 2006


Feedback score: (2)
Leave feedback

Rate this member

Report this Post02-05-2008 08:51 PM Click Here to See the Profile for HurricaneSend a Private Message to HurricaneDirect Link to This Post
or have the thickness of the reluctor ring machined off the dampner
IP: Logged
rjblaze
Member
Posts: 1157
From: Bethlehem, Pa., United States
Registered: May 2006


Feedback score:    (19)
Leave feedback

Rate this member

Report this Post02-06-2008 07:09 AM Click Here to See the Profile for rjblazeClick Here to Email rjblazeSend a Private Message to rjblazeDirect Link to This Post
I thought about that too. I believe the difference in the face of the two dampers is that the three "spokes" that have the pulley mounting holes "sticks out" on our damper and are "recessed" on the FWD damper/pulley. I still have not found a good pic of our damper by itself to be sure. You just might have hit the nail on the head!.
IP: Logged
Pyrthian
Member
Posts: 29541
From: Detroit, MI
Registered: Jul 2002


Feedback score: (5)
Leave feedback





Total ratings: 341
Rate this member

Report this Post02-06-2008 08:32 AM Click Here to See the Profile for PyrthianClick Here to Email PyrthianSend a Private Message to PyrthianDirect Link to This Post
in order for the crank trigger to work, the ring must protrude from the dampner enough, so the pickup senses the holes.

anyways - it does look like that ring & pickup can be made to work - one way or another.
IP: Logged
JazzMan
Member
Posts: 18612
From:
Registered: Mar 2003


Feedback score:    (7)
Leave feedback





Total ratings: 653
User Banned

Report this Post02-06-2008 08:44 AM Click Here to See the Profile for JazzManClick Here to Email JazzManSend a Private Message to JazzManDirect Link to This Post
Does this help?





JazzMan

[This message has been edited by JazzMan (edited 02-06-2008).]

IP: Logged
rjblaze
Member
Posts: 1157
From: Bethlehem, Pa., United States
Registered: May 2006


Feedback score:    (19)
Leave feedback

Rate this member

Report this Post02-06-2008 01:48 PM Click Here to See the Profile for rjblazeClick Here to Email rjblazeSend a Private Message to rjblazeDirect Link to This Post
Jazz....you are da' Man! Thanks a bunch! Those pics definitely help a bunch. Now hopefully the trigger wheel is large enough in diameter! You wouldn't happen to know the actually diameter of our damper, would you?
IP: Logged
JazzMan
Member
Posts: 18612
From:
Registered: Mar 2003


Feedback score:    (7)
Leave feedback





Total ratings: 653
User Banned

Report this Post02-06-2008 01:51 PM Click Here to See the Profile for JazzManClick Here to Email JazzManSend a Private Message to JazzManDirect Link to This Post
Not a clue, but if I can find on in my spares tonight I can measure one for you. Will post back tomorrow.

JazzMan
IP: Logged
rjblaze
Member
Posts: 1157
From: Bethlehem, Pa., United States
Registered: May 2006


Feedback score:    (19)
Leave feedback

Rate this member

Report this Post02-06-2008 02:16 PM Click Here to See the Profile for rjblazeClick Here to Email rjblazeSend a Private Message to rjblazeDirect Link to This Post
thx
IP: Logged
rjblaze
Member
Posts: 1157
From: Bethlehem, Pa., United States
Registered: May 2006


Feedback score:    (19)
Leave feedback

Rate this member

Report this Post02-09-2008 12:44 PM Click Here to See the Profile for rjblazeClick Here to Email rjblazeSend a Private Message to rjblazeDirect Link to This Post
Any luck Jazz?
IP: Logged
rjblaze
Member
Posts: 1157
From: Bethlehem, Pa., United States
Registered: May 2006


Feedback score:    (19)
Leave feedback

Rate this member

Report this Post02-17-2008 12:57 PM Click Here to See the Profile for rjblazeClick Here to Email rjblazeSend a Private Message to rjblazeDirect Link to This Post
bump ^^^^^^^^
IP: Logged
PFF
System Bot
mswenson289
Member
Posts: 195
From: Cleveland, MO. USA
Registered: Dec 2007


Feedback score:    (8)
Leave feedback

Rate this member

Report this Post02-17-2008 03:09 PM Click Here to See the Profile for mswenson289Click Here to Email mswenson289Send a Private Message to mswenson289Direct Link to This Post
Both HB from the 3.4 RWD and 2.8 are the same diameter. both belt pulleys are the same diameter, where they differ is configuration for belt type. they don't appear to interchangeable.

[This message has been edited by mswenson289 (edited 02-17-2008).]

IP: Logged
rjblaze
Member
Posts: 1157
From: Bethlehem, Pa., United States
Registered: May 2006


Feedback score:    (19)
Leave feedback

Rate this member

Report this Post02-17-2008 09:35 PM Click Here to See the Profile for rjblazeClick Here to Email rjblazeSend a Private Message to rjblazeDirect Link to This Post
I am trying to compare the 2.8 / 3.4 RWD type damper and pulley we use on the Fiero to a 2.8 / 3.1 / 3400 FWD combo damper/pulley arrangement. Thanks for the input.
IP: Logged
Hudini
Member
Posts: 7956
From: Shanghai, China
Registered: Feb 2006


Feedback score: N/A
Leave feedback





Total ratings: 158
Rate this member

Report this Post02-17-2008 10:01 PM Click Here to See the Profile for HudiniClick Here to Email HudiniSend a Private Message to HudiniDirect Link to This Post
I just measured the HB at 6 3/8" and the Fiero pulley at 6 9/16" (outside edge to outside edge). Used a tape measure so it's not perfect.

[This message has been edited by Hudini (edited 02-17-2008).]

IP: Logged
rjblaze
Member
Posts: 1157
From: Bethlehem, Pa., United States
Registered: May 2006


Feedback score:    (19)
Leave feedback

Rate this member

Report this Post02-18-2008 12:24 PM Click Here to See the Profile for rjblazeClick Here to Email rjblazeSend a Private Message to rjblazeDirect Link to This Post
Thanks Hudini. The HB you measured was the one we have for the Fiero, right? Now all I need is to get a measurement for is the HB for a FWD 60* V6. I guess another trip to the pick'n'pull. I really want to get this crank trigger / sensor to work for the DIS conversion!
IP: Logged
JazzMan
Member
Posts: 18612
From:
Registered: Mar 2003


Feedback score:    (7)
Leave feedback





Total ratings: 653
User Banned

Report this Post02-18-2008 01:18 PM Click Here to See the Profile for JazzManClick Here to Email JazzManSend a Private Message to JazzManDirect Link to This Post
Sorry, I missed this thread and forgot to post back. I couldn't find one in my spares to measure. Thanks, Hudini, for getting that info!

JazzMan
IP: Logged
bnevets27
Member
Posts: 264
From: Ontario, Canada
Registered: Oct 2007


Feedback score: (1)
Leave feedback

Rate this member

Report this Post03-15-2008 02:28 PM Click Here to See the Profile for bnevets27Send a Private Message to bnevets27Direct Link to This Post
If the reluctor wheel needs to be modified or a new one made, I could do it. Just need some info on what needs to be done. I'm also trying to get DIS on my stock 2.8. Or if spacers for the pulleys need to be made.

Anyone have some more incite on this?
IP: Logged



All times are ET (US)

T H I S   I S   A N   A R C H I V E D   T O P I C
  

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery | Ogre's Cave
Real-Time Chat | Fiero Related Auctions on eBay



Copyright (c) 1999, C. Pennock