ModernMuscleCars.net - Modern Muscle Cars Archive - HELP.FORD 302 RACE ENGINE HELP. AND IM NEW HERE..

Pages: 1

HELP.FORD 302 RACE ENGINE HELP. AND IM NEW HERE..
(Click here to view the original thread with full colors/images)

Posted by: MR FORD MAVERICK

Hi..

Need some help.
Engine breaks up at high rpms or under load.
Engine has new heads and all specs are as per manufacturers.
I will list the components and go from there any help you can give please..

1992 short block,all internals are forged and tested and balanced.
1965 heads 48 to 52 cc heads rebuilt with SS valves and roller springs for hyd ROLLER over 600 lift or more.
Victor jr
HOLLEY 700 dp
jets are like 72 78s frt/rear guestimate
plugs are nice brown
autolite platinums AP45

New pushrods COMP SWEDGE
1.7 EXTRUDED ROCKERS
7/16TH STUDS
I believe he went with 1.90 intake and the exh is stock.
It has a hyd roller with about 235 int and 242 exh,,dont have cam card with me,I will find it later for you all,
The cam was installed straight up,sorry.
There is adequate valve to piston clearance as its gone way up to 6k no problem before. and will still but it breaks up.
I have ALL MSD components,
6al
blaster 2
pro billet std 8582
AP45 plugs
ford racing 9mm wires
long tube headers for the car.
Motor is studded.
I tested the dist for polarity/and ohms in spec.
It fires nice and runs good idle and just above and then starts just rummblin.
Very responsive as everyone is telling me this cam is too big and with the 1.7rockers makes for a big street motor.
It runs good all around town but when I get it in the pedal it goes and still pulls but misses and breaks up and sputters,,
I have a 2400 stall
and 2.5 inch exhaust with flowmaster 40 series and turndowns.
I hope that I have supplied enough info on this.
Let the game begin,and thanks if you can help.
You may email me please at SFORACING@SBCGLOBAL.NET

I also have stuff for sale if im allowed to post it here? if not beg your pardone and please direct me then..
Being disabled from cancer is very rough so I am just trying to get this thing done and have fun with the time the lord has given me so please any help.
I am on yahoo messenger DASKLEINBRUDER

thanks,,,tom

Posted by: LS1JAY

Hopefully some of the Ford guys will chime in soon.

Welcome to MMC!

Posted by: John

If it's breaking up does it get worse as the RPM's increase? I'm thinking you have a timing advance problem. Then again, it's really hard to tell without being in front of it. Does it blow gray smoke or does it blow black smoke when it's missing? Does it smell rich?

It's difficult to tell. You already gave the list of parts, can you describe the problem in any more detail? As much as possible, the more the better. Things like what RPM does it start at, what's the weather like when it happens? Does it happen every time without fail? Is it intermittent? Does it happen when you are doing the burnout? What kind of fuel are you running? Any and all details will help out.

Posted by: MR FORD MAVERICK

I have gone and figured it out. I brought a fresh perspective upon this problem and we figured it was totally the timing.
I have never gone with a cam and combo this big before this sucker does rumble big time..I was too far advanced and cuz I am using that opossite side intake water pump I could not see the timing marks.duh,,so we reset the timing from TDC and marked it on the other side with a different marker and went from there. We are close in the timing now but it still breaks up a little bit here and there. I will retard it just a little more and work the carb and see then go and rejet it down to like 70 up front and then 78 rear..I think that would be a good combo. This thing does NOT LIKE less than 93 octane,cuz of those heads..I will check in later,,thankx...tom

Posted by: John

I like being right!

If it's still breaking up, try running the 104 octane "purple gas" from the track. Also, check the heat range on your plugs. That might be causing problems too. You could always run V16 too. That's expensive though.

Where does the break up still occur? What RPM, high or low? Or does it do it at like a shift point? If it's doing it after a shift point, your timing might not be backing down fast enough. That 8582 is a mechanical advance and if I remember correctly, it uses fly weights on the timing advance. If it's breaking up at a shift or just after you let off, the advance isn't backing down fast enough and you need to adjust those weights and possibly springs.

If that is happening, that's not a good thing because you'll have raw fuel left in the chamber when the next gear kicks in and it's going to be slightly rich just as it hits the power band. If that happens, it'll bog down a bit and can cost you a few thousandths of a second. Not a big deal but if you are shifting 2, 3 or sometimes 4 times in a 1/4 mile, you'll end up losing a couple of seconds just because of the time it take the engine to recover from that itty bitty bit of fuel.

I know you think it sucks but these little problems are the FUN part about racing! Figuring out why it's doing it, then fixing it and heading back out and blowin' the next guy's doors off just flat out rules! It's especially good when the guy in the next lane is scared of you 'cause he knows you're gonna take him! Even if you break, they still don't want to draw you in the ladder because you'll be there, next round, showin' him your tail-lights!

Yeah, racin' is AWESOME!

I wanna go again. Nothing good in the summer though. Too hot. Got a track rental coming up though! WOOHOO!!!

Yeah and I don't care how good a driver or owner is, he ain't shit without his mechanic! I'm glad to hear you figured it out! Now get back out there and lay the smack down! Oh yeah, and remember, SHINY SIDE UP!

Posted by: John

Oh and it's not the heads that are causing the problem of not like less than 93, it's the compression ratio. Since they are '65 heads, I'm bettin' they're cast iron. Aluminum heads would help you out alot in that department but your setup is your setup. You choices are either back off the timing or run a higher octane.

Posted by: Grape Ape

The small chambers will bump compression and you should run higher octane fuel in such an engine. An octane booster should help. Beyond the obvious timing issues, you are thinking to use smaller jets in the carb. You don't have a monster size engine, so you don't likely need a huge carb. Running smaller jets is your option instead of using a smaller carb. If you continue to have the problem, look into the distributors internals and double check all wire connections.

Back to the Forums