i was just curious if anyone is running one, any comments on it? idle quality (not important)?

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Eric
'87 GT Gold/Tan 4-speed
Soon to be Turbo T-top

SAVE THE SHAUN!!!

Fieromaster88 has this cam along with 1.6 rockers in his car. I've driven the car and it idles smooth. He has a 3.2.

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Activities Director N.I.F.E.

Use the search feature, there are a dozen ior so members that used that cam. Watch out for coil bind issues.

quote Originally posted by Solo2: Use the search feature, there are a dozen ior so members that used that cam. Watch out for coil bind issues.

That's a good point that i forgot to mention. Evidently Crane is recomending the wrong springs for this cam. Someone please correct me if i'm wrong but i believe the springs you actually need are part# 99849-12 instead of the 99848-12's that they suggest in the catalog. I can't remember the forum members name that researched this but he said Crane actually suggests the 99849 springs instead of the 848's on the phone. Evidently the 848's cause coil bind at certain lifts. Again, i'm not 100% positive on this information so make sure you check it out.
Please feel free to correct or confirm me on this one anywone.

The info on the Crane springs came from me....The info is correct for my heads at least...I used a gauge to measure the exact install height (intake and exhaust are actually different height due due to the removal of the rotater when using new springs)...I do not have the data in front of me, but I can tell you that it is not the 1.70" that the springs are tested at....I believe it was more like 1.58 or so (don't use this!!!!measure your own!!!) With this height and the 848's, coil bind will occur with even the 2030 cam (at 4.23 lift(?))....The definition of coil bind should be read as "less than .060 clearance between any coil" This is to allow for heating/cooling of and some tolerance in the springs...As a side note, I ran mine with 848's switched to the 849 to eliminate what I thought was valvetrain noise...I am dissapointed in the noise of the Crane lifters/springs with either set installed. Very "ticky"...

I'm running a the GM Performance equivilant of the 260-2, and I am quite pleased with it. I decided to use my stock springs for my heads ('95 3100) and have seen no ill effects, yet.
Idle is generally smooth, but I haven't been able to tune it yet, I do get some wierd loping at times, only when cold. I pull between 18" to 20" hg at idle. It also works well with boost.

I just looked on the Crane site and they reccomend the 99848-12.

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The Raven :Under Construction
"James" 1985 GMC Jimmy, 3.2L turbocharged intercooled hybrid 13.873 @ 99.08

"Speed Costs, How fast do you want to go?"

[This message has been edited by The_Raven (edited 12-19-2003).]

"The info on the Crane springs came from me....The info is correct for my heads at least...I used a gauge to measure the exact install height (intake and exhaust are actually different height due due to the removal of the rotater when using new springs)...I do not have the data in front of me, but I can tell you that it is not the 1.70" that the springs are tested at....I believe it was more like 1.58 or so (don't use this!!!!measure your own!!!) With this height and the 848's, coil bind will occur with even the 2030 cam (at 4.23 lift(?))....The definition of coil bind should be read as "less than .060 clearance between any coil" This is to allow for heating/cooling of and some tolerance in the springs...As a side note, I ran mine with 848's switched to the 849 to eliminate what I thought was valvetrain noise...I am dissapointed in the noise of the Crane lifters/springs with either set installed. Very "ticky"..."

The 1.58" mark came from the service manual that states that the installed height should be 40mm which equals to 1.58"
I am currently installing the 848's right now my target is at 1.700" beacause I have the 1.6 ratio rockers that make my lift from .423 to .451.

I will find out the hard way I guess if the coil bind issue is true.

so do these 99849-12 springs need modifications to the heads to fit, or are they a drop in?

Solo,

Are you going to machine the heads to obtain the 1.7? I tried like hell to obtain retainers and locks that would get me the 1.7", but the specifications are not consistent across vendors. They use their own reference point and cannot tell how this relates to the stock components...so, from what I found, to get 1.7, you will need to either machine the spring bases or obtain longer valves (which causes other issues). On the phone, if you tell the Crane techs that your lift is 1.58(?) they will refer you to the 849's...the documentation is for a known 1.7" install height. If I remember correctly, they 848's at 1.58 will place almost 100lbs more pressure on the valve at installed height, not to mention potentially bind at open...

I notice that Crower also shows a 1.7" installed height for the #68301x1 spring that they recommend.

By measuring from the top of the "retainer cap" (ya know what I mean?) to the spring base I get an installed height of 1.68-1.69".

I wonder if there are some year to year differences?

As the owner of some uninstalled 848 springs I would love to see the final answer. I purchased the springs from the Fiero Store.

Thanks
Dan

Am i measuring incorrectly? What is the correct way to measure installed height?

All of the manuals that I can find show 1.57 as the correct height.

Thanks
Dan

[This message has been edited by DanielKJenkins (edited 12-21-2003).]

The crate HT 3.4 engine uses the same Crane cam so i wonder if maybe if you used the springs from GM that the HT 3.4 uses if this would work without bind?
I would assume that GM uses the same springs as Crane is recomending but if they're selling this crate engine and there's no reports of problems so far maybe these springs are correct for the 60* V6 and this cam since the heads are the same?

I show the GM parts numbers for the HT 3.4 springs and retainers as follows:
spring part# 12363230 with a note that says to use retainer part#12363216

Here is a description from GM about the 3.4HT crate engine valve spring

12363215 Valve Spring
This valve spring is used in the new 3.4-liter engine conversion package (P/N 12363230) and designed for moderate performance usage. Manufactured from chrome silicon wire, this spring produces 105 pounds of seat pressure at an installed height of 1.70" and 296 pounds open pressure at a height of 1.20".

Our part#s don't match. I wonder if GM has changed something?

[This message has been edited by DanielKJenkins (edited 12-21-2003).]

There are spring shims that are in .015, .030, .045, etc. spacings. The down size is that for every .015 you reduce the spring by 2 to 3 lbs.
I might be going with spring shims but would not go beyond .030 a local chevy speed shop is working on my heads. I will see how they will warranty my heads by solving the coil bind issue. Will let you know soon.