[DeTomaso] Ford 392 rev limit?

[shawkins777 at comcast.net]

Depends on what his crank is made of also. 

Steve 

----- Original Message -----
From: "Julian Kift" <julian_kift at hotmail.com> 
To: "MikeLDrew at aol.com" <mikeldrew at aol.com>, "De Tomaso List" <detomaso at poca.com> 
Sent: Thursday, September 5, 2013 4:26:08 PM 
Subject: Re: [DeTomaso] Ford 392 rev limit? 

An engine builder once told me to use a rule of thumb limit of 4,000 fpm piston speed, which assuming you have a 4.030 bore by 3.85 stroke would equate to setting the rev limiter at 6,200, so looks like you are about right. 

Julian 

> From: MikeLDrew at aol.com 
> Date: Wed, 4 Sep 2013 22:40:10 -0400 
> To: detomaso at POCA.com 
> Subject: [DeTomaso] Ford 392 rev limit? 
> 
> Hi guys, 
> 
> During the dark days when the forum was down, Jeff Cobb posted a query and 
> it was rejected, so he asked me to post it for him (below). There are 
> actually two posts--start at the bottom one and work your way up. 
> 
> Mike 
> 
> ==== 
> 
> From: JEFFREY COBB <zumzum at cox.net> 
> Subject: Re: 351 rev limit 
> Date: August 29, 2013 1:54:13 PM CDT 
> To: "detomaso at poca.com List" <detomaso at poca.com> 
> Cc: Jeff Cobb <zumzum at cox.net> 
> 
> Hello again about the rev limit question, 
> The engine specs are: 
> Ford Racing 392 Windsor stroked, 
> 360 hp at rear wheels from the dyno sheet 
> GT40 Heads--9.7:1, 
> Mighty Demon 750 
> Ford Racing steel flywheel 
> Tremac TKO 3550 5 speed and 3.73, 
> 
> Any help would be appreciated, 
> Thanks, 
> Jeff 
> _________________________________________________________________________ 
> On Aug 29, 2013, at 6:13 AM, Jeff Cobb wrote: 
> 
> 
> Hello group, 
> 
> 
> 
> 
> 
> Hope you all can provide info. 
> 
> 
> A 2000 Superformance Cobra came back in yesterday for some finish up work 
> while I was tuning up a 57 Ford Fairlane Skyliner with a Police Interceptor 
> 392 engine. 
> 
> 
> Just bought by a faithful customer and he wants me to do what I want to do 
> to make it better and faster. 
> 
> 
> 
> 
> 
> My question to you guys is about the safe rev limit. It has a 351 taken out 
> to a stated 392, the largest Demon carb I've ever seen and a MSD 6AL with a 
> 6100 rpm limit chip. 
> 
> 
> 
> 
> 
> Problem is that this strong engine will instantly bang off the limiter too 
> quickly in the first three gears. Engine is very smooth at high rpm's and 
> feels as if it would rocket well past past 6,100 with no problem. 
> 
> 
> 
> 
> 
> I do not know cam, rear end ratio, compression or any other specs and I 
> will try to find out today. Torque peak feels the strongest about 3,000 to 
> 4,100 with 6,1000 coming in too soon. 
> 
> 
> 
> 
> 
> What rpm limiter chip do you all recommend for what I have described? 
> 
> 
> I have little history with higher rpm ceilings of large FORD engines. 
> 
> 
> Owner is a 64 year old just math professor hot rodder who drives little and 
> want to have fun before his last personal rev limit. 
> 
> 
> We don't desire to scatter his engine and he might buy and use some of my 
> VP 110 leaded race gas which will also help. 
> 
> 
> 
> 
> 
> Thanks for any input, 
> 
> 
> 
> 
> 
> Jeff Cobb 
> _______________________________________________ 
> 
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> 
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