How ya goin. Just thought I would post my engine specs for all to see. Its a good streetable motor, plenty of torque and strong top end. It hasent been dynoed but ive run it dowm the drags with a best of 11.5 @ 185kph. My gearing is still wrong, it hits 6900rpm over the line, shifting at 6200. Here it is. Ofset ground 4ma crank.
Polished\shot peened\ balanced chev rods
Fordged TRW flat tops 30" over giving 378ci and around 11.5comp
Crane F238 solid cam
Lunati adjustable roller rockers with Ford msport guid plates
AFD 2v alloy heads unported. 2.05" intake valve 1.75" ex
Holley street dominater manifold, 1" spacer
Holley 850 annular discharge carb
Electronic dizzy, MSD 6al ign.
1 7\8" primary to 3.5" collector 4 into 1 extractors.
C4 auto 2500 stall(still a bit low)
3.89 diff gears.
At the moment the moroso power speed calculator indicates around 340hp at the wheels. Id like to hear everyones thoughts\comments.
Sorry STROKEXD 115mph it is then!
The motor is realy nice to drive on the street. It idles well, has heaps of torque all over the rev range. It is a bit thirsty, but who cares about fuel consumption! It is in a 71 Capri. All registerd with permits and engineer aproval. 2900lb with me in it.
A bigger cam would make alot more hp, but, the down side to a lite car is small wheel arches. Bigger cam = bigger converter= choping up rear guards to fit bigger slicks.
Im just gona work with it how it is for a while. I feel i can get more playin with diff ratio and possibly slick diameter. And tuning, and dropping the exhaust ect ect...
There is a pic of my car on page 61 of the latest performance ford mag if your interested.
What does your car weigh?
What is your 60ft and 1/8 mph
It seems to me you are missing some hp and its not because of the f238.
you can pick up a few 10th's easily with the right tune up.
are you running 25 or 26inch tyres?
Your rpm problem at the line is similar to my problem where its all out of breath in the last couple of hundred feet. I'm running a XC (3510 lb) with a std stroke bottom end and also shiffting at 6200 and I'm crossing the line at 112mph at 6600rpm.
I've found my problem is not to short gearing but too much slip in the converter (13%) If you are using the size tyre I suspect it may be your problem also.
The Capri weighs 2900lb. Im only running a 22 inch diameter slick! My torque converter is getting about 200-300rpm slip acording to moroso power speed calculator. My best 60ft is 1.750 my1\8 is 7.398 at 153.02 kph.(time slip doesnt have mph at 660')
Im happy with the cam. So far ive only driven the car to the drags, bolted the slicks up and raced. I want to start playin with the tune next time. I will keep you posted of any improvements.
getting a fair bit of wheelspin looking at that 60ft. If not theres something else going on there. It will probably end up with high 1.5's and low 11's, nothing to be sneezed at!
Taller slicks and tune might get you there without a converter change. Good luck.
The numbers are sweet. You may want to consider just taking it down to a reputable chassis dyno and seeing what it happening with it, if you haven't already. A good dyno operator can tell you what your converter is doing and what kind of RWHP you're making. You can then use that information to figure out what you should be doing. I agree that the 1.75 '60 is a bit of a disappointment. It isn't bad, it just isn't good. It does act like it wants a 3400-3600 stall converter! Once you go in that direction, streetability starts to be an issue.
11s are very respectable. Much quicker and it really stops being a streetable car, IMO.
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