Pennock's Fiero Forum
  Technical Discussion & Questions
  a few questions about an iron headed 3400

Post New Topic  Post A Reply
Email This Page to Someone! | Printable Version


next newest topic | next oldest topic
a few questions about an iron headed 3400 by Sigler85GT
Started on: 08-20-2013 07:40 AM
Replies: 6 (211 views)
Last post by: Francis T on 08-20-2013 04:00 PM
Sigler85GT
Member
Posts: 209
From: Elkhart, IN
Registered: Aug 2010


Feedback score: N/A
Leave feedback

Rate this member

Report this Post08-20-2013 07:40 AM Click Here to See the Profile for Sigler85GTClick Here to Email Sigler85GTSend a Private Message to Sigler85GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
First off, not looking for any 3800 is way better talk. I alreay have that covered. Or the aluminum heads are better than the iron. I am not arguing this but i like the way our cars look from the factory. For the most part. I understand the mechanical parts that are needed to mate the two together.

what hp can the stock bottom end take on the 3400?

I know the compression ratio is lowered if using the iron heads and stock 3400 pistons but what is the ratio exactly?

If you were to boost the iron heads would the intake restriction still be as big of a problem as it is NA?
And if you were to remove the fin from the heads does that matter with the boost being added?

Would the 7730 icm be a wise choice to run the engine with and will it support the 3400 stock coils?
IP: Logged
PFF
System Bot
masospaghetti
Member
Posts: 2477
From: Charlotte, NC USA
Registered: Dec 2009


Feedback score:    (10)
Leave feedback

Rate this member

Report this Post08-20-2013 10:29 AM Click Here to See the Profile for masospaghettiClick Here to Email masospaghettiSend a Private Message to masospaghettiEdit/Delete MessageReply w/QuoteDirect Link to This Post
I can only answer the last question, yes, the 7730 will run the stock 3400 ignition module and coil pack. I have that setup on my 3500.
IP: Logged
Blacktree
Member
Posts: 20715
From: Central Florida
Registered: Dec 2001


Feedback score:    (12)
Leave feedback





Total ratings: 350
Rate this member

Report this Post08-20-2013 02:18 PM Click Here to See the Profile for BlacktreeClick Here to visit Blacktree's HomePageClick Here to Email BlacktreeSend a Private Message to BlacktreeEdit/Delete MessageReply w/QuoteDirect Link to This Post
The bottom end on the 3x00 V6 is pretty robust. It can safely handle 300 HP, maybe more. That's probably more HP than your iron heads will allow, unless you really crank up the boost.

If you put the iron heads on a stock 3400 bottom end, your compression ratio is going to be horribly low. It'll probably be less than 7.5:1.

Keep in mind that a turbo isn't a magic wand that you can use to make the laws of physics disappear. If the heads are a flow restriction when naturally aspirated, then they will also be a flow restriction when turbocharged. You'll just need more boost to force the air through them.

The 7730 ECM works just fine with the 3x00 ignition system. I know from personal experience.
IP: Logged
sleevePAPA
Member
Posts: 776
From:
Registered: Jan 2013


Feedback score: N/A
Leave feedback

Rate this member

Report this Post08-20-2013 03:05 PM Click Here to See the Profile for sleevePAPASend a Private Message to sleevePAPAEdit/Delete MessageReply w/QuoteDirect Link to This Post
IP: Logged
Sigler85GT
Member
Posts: 209
From: Elkhart, IN
Registered: Aug 2010


Feedback score: N/A
Leave feedback

Rate this member

Report this Post08-20-2013 03:20 PM Click Here to See the Profile for Sigler85GTClick Here to Email Sigler85GTSend a Private Message to Sigler85GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
My understanding is youre cramming the air anyway so not a big issue. I would like to retain the semi stock look. For massive power i would just buy a bigger turbo for the 3800. Would decking the heads do much to raise the C/R to about 8
IP: Logged
Sigler85GT
Member
Posts: 209
From: Elkhart, IN
Registered: Aug 2010


Feedback score: N/A
Leave feedback

Rate this member

Report this Post08-20-2013 03:40 PM Click Here to See the Profile for Sigler85GTClick Here to Email Sigler85GTSend a Private Message to Sigler85GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
I dont know why my phone double posts like that. It needs to be deleted. Sorry guys.
IP: Logged
Francis T
Member
Posts: 6620
From: spotsylvania va. usa
Registered: Oct 2003


Feedback score: (1)
Leave feedback





Total ratings: 119
Rate this member

Report this Post08-20-2013 04:00 PM Click Here to See the Profile for Francis TClick Here to visit Francis T's HomePageClick Here to Email Francis TSend a Private Message to Francis TEdit/Delete MessageReply w/QuoteDirect Link to This Post
I wouldn't submit a v6 duck-iron crankshaft to 300 HP, but as stated above; you won't get near that without lots of boost. Yes, the stock intake will cut down some on your boost gains, but it won't negate it completely. I noticed the difference in power between the stock and our first custom unit intake; especially when not in boost. If you're not looking for max power, a boosted 2.8 or 3.4 engine with a stock intake will suffice. Do incorporate an intercooler. Just keep in mind the 3.4 is a stroker, don't try to rev it too high.

------------------
http://i16.photobucket.com/...ancis44/100_1147.jpg
[/URL]
[IMG]http://i16.photobucket.com/albums/b50/francis4
4/000_0451-1.jpg[/IMG]
trueleo.com
RSpiderII@aol.com

IP: Logged

next newest topic | next oldest topic

All times are ET (US)

Post New Topic  Post A Reply
Hop to:

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