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12-01-2010, 11:22 PM
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CC Member
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Join Date: Nov 2010
Cobra Make, Engine:
Posts: 11
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Not Ranked
High compression motor build questions
Hey guys, n00b here and I'm building a 351W, stroking it to a 427 and was wondering what the highest compression ration you can have and still run on 93 octane. I'm trying to get all the horsepower I can out of the motor, but don't want to set the compression too high and mess with the timing so much that i defeats the purpose of it being a high comp. motor. Any input would be appreciated, about the fuel and what parts have worked best for hp gains.
I want something that's still streetable but also a good weekend racer. So far these are the mods I've been planning on doing; this stroker kit from Coast High Performance http://www.coasthigh.com/Ford-427W-F...7-ps-f427w.htm, with these AFR aluminum heads, a custom ground cam from comp cam, wasn't too sure about the intake manifold but was thinking maybe an Edelbrock Performer RPM, or a dual quad, with maybe an 800 cfm Edelbrock carb. If I'm missing anything let me know, or if i left out some info please ask, I'm half asleep while writing this.
Foti
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427 build in progress
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12-02-2010, 02:51 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Aim for 10-10.5 and you'll be pretty safe.
Where are you from?
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12-02-2010, 03:18 AM
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CC Member
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Join Date: Dec 2001
Location: Castalia,
Oh
Cobra Make, Engine: EM cobra, 450 inch sbc running a best ET of 9.14..so far..ALL MOTOR...approx 800 horse.............ERA with 482 FE..All Aluminum Engine
Posts: 1,395
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Not Ranked
highest C/R for 93
Same guy, same question asked here...
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Jack
XSSIVE .....
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12-02-2010, 04:02 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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I knew something sounded familiar.
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12-02-2010, 08:11 AM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Quote:
Originally Posted by blykins
I knew something sounded familiar.
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Yes he's the same guy. He finally answered my posts in his first thread over in FE's. He realizes he made a mistake. I told him in future to post here in Small Block Talk as many small block guys don't look at FE. I told him he could get more help from the SB guys here. I also got him started on some advice.
See here from post 18 on:
highest C/R for 93
So how about helping out a newb-Brent this is you kind of stuff...
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Chas.
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12-02-2010, 08:35 AM
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CC Member
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Join Date: Aug 2006
Location: Broken Arrow,
OK
Cobra Make, Engine: FFR MK III,462 FE/TKO 600, IRS w/3.27
Posts: 129
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Not Ranked
427Bullitt......Only one comment, and that is for your carb choice. Just my opinion, not being critical of you!
I've had several engines w/Edel carbs, and they're OK (for me) if the cams are mild, for stock/medium performance engines. I don't know how much cam you are planning on, but I've never had any satisfaction w/Edel carbs if my cam had much duration, or if I was looking for high performance. I always wound up going back to a Holley/clone.
Good luck!
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Wideglidejoe
FFR#6143 Mk III: FE 462" w/four 48 IDA Weber's w/TKO 600 .82, IRS w/3.27, 17" Team III's w/245/45's & 315/35's. Gas N's.
Picked it up end of Aug '08
First start May 12, '10
First go kart May 26, '10
Tag & title 5-26-11, driving in gel coat
Painted Nov 2015
'05 Harley Wide Glide (60 hp stock, now 107 hp & 107 ft/lbs at wheel. Mid 11's in the 1/4 mi.)
'55 Bel Air hot rod project (WIP)
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12-02-2010, 09:12 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Be glad to...
Hey 427, give me a call when you get some time to chat.
502.759.1431
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12-02-2010, 05:14 PM
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CC Member
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Join Date: Nov 2010
Cobra Make, Engine:
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Quote:
Originally Posted by blykins
Aim for 10-10.5 and you'll be pretty safe.
Where are you from?
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Orlando, Fl... turns out there's more than one Orlando in the U.S.
Quote:
Originally Posted by Hotfingrs
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Yea that's me, during my brain fart.
Quote:
Originally Posted by wideglidejoe
427Bullitt......Only one comment, and that is for your carb choice. Just my opinion, not being critical of you!
I've had several engines w/Edel carbs, and they're OK (for me) if the cams are mild, for stock/medium performance engines. I don't know how much cam you are planning on, but I've never had any satisfaction w/Edel carbs if my cam had much duration, or if I was looking for high performance. I always wound up going back to a Holley/clone.
Good luck!
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Plan on having a really big cam
Quote:
Originally Posted by blykins
Be glad to...
Hey 427, give me a call when you get some time to chat.
502.759.1431
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will do
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427 build in progress
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12-03-2010, 10:37 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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No....DCR is a good tool to use IMO when you really want to fine tune a build, but you're pretty much safe with 10 to 10.5 with most street cams and aluminum heads. I use Pat Kelleys calculator and I wouldn't go over 8.5 on 93 and aluminum heads.
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12-03-2010, 11:01 AM
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CC Member
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Join Date: Dec 2001
Location: Castalia,
Oh
Cobra Make, Engine: EM cobra, 450 inch sbc running a best ET of 9.14..so far..ALL MOTOR...approx 800 horse.............ERA with 482 FE..All Aluminum Engine
Posts: 1,395
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Not Ranked
Just ran my figures and have a static of 11-1 and dynamic of 8.59
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Jack
XSSIVE .....
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12-03-2010, 07:07 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Quote:
Originally Posted by Hotfingrs
Just ran my figures and have a static of 11-1 and dynamic of 8.59
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I'd do it on an engine that I'd build for myself...or a race engine, but I wouldn't build one that tight for a customer. It can work and often does, but it would be more of a worry than a benefit for an engine builder. The amount of horsepower that you gain by an extra 1/2 point of static compression really doesn't outweigh the risks. The customer could always install the engine in a 5000 lb car that runs uphill at 1500 rpm all the time in 100° weather. 
For a regular street engine, I usually aim for 10-10.5 and don't have any problems with that and the camshafts that I run.
Block prep/piston prep/good machining also eliminates a lot of issues with the higher compression ratios. Eliminating all sharp edges on the pistons, running a tight quench, and running efficient chambers helps a ton. I always try to run about .040" quench on the engines that I build. That means that the block gets machined so that the pistons are sitting at zero deck.
Last edited by blykins; 12-03-2010 at 07:10 PM..
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12-05-2010, 10:06 PM
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Join Date: Nov 2010
Cobra Make, Engine:
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sorry i haven't called yet, been super busy with some legal issues and keep forgetting.
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427 build in progress
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