mcmmotorsports1548534724 Posted January 26, 2007 Share Posted January 26, 2007 Okay, you guys don't need to reveal to me any secrets, but I am curious.... Those running the 200,xxx mile engines that have never been opened, what are your RWHP #'s. I thought I saw somewhere some of the Mustang guys claiming over 200 rwhp, but with only 225 Crank HP when new, I am kinda curious how they did it. My setup will more than likely be the 302 spec option since I don't really think a 4.6 would do all that well in CMC. Thanks. Quote Link to comment Share on other sites More sharing options...
bsim Posted January 26, 2007 Share Posted January 26, 2007 I know Greg Robinson had a high mile motor in his fox-body, and it was more like 185 HP. Quote Link to comment Share on other sites More sharing options...
King Matt1548534716 Posted January 26, 2007 Share Posted January 26, 2007 CMC allows a lot of mods that can increase the HP over stock, such as removing all smog equipment, changing pulleys, opening up the exhaust after the headers, removing cats, bumping timing, etc., so even a tired motor can make more than the factory rating. Plus, the factory 225hp flywheel rating is probably conservative to begin with. I've seen a few high-milers making 210-215 rwhp and 275 lb-ft, but I'm still scratching my head about how to make 230/300 with a totally "stock" injected 5.0. But that's another discussion. Quote Link to comment Share on other sites More sharing options...
Greg R. Posted January 26, 2007 Share Posted January 26, 2007 Good memory Brad. But, you forgot to point out that in addition to 185hp, I had 10"/single piston front brakes with rear drums. I ran mid-pack and had a ball. Ah, those were the days... The '86 motor was the first year of FI and used junk heads so it was pretty weak even without the 150K on the clock. The rebuild featured "better" head castings and a careful job of assembly. An adjustable fuel pressure regulator along with a bigger capacity fuel pump allows some fine tuning as well. It wasn't too hard to hit about 210HP/275TQ. Greg Robinson Quote Link to comment Share on other sites More sharing options...
GT4Point6 Posted January 26, 2007 Share Posted January 26, 2007 Okay, you guys don't need to reveal to me any secrets, but I am curious....Those running the 200,xxx mile engines that have never been opened, what are your RWHP #'s. I thought I saw somewhere some of the Mustang guys claiming over 200 rwhp, but with only 225 Crank HP when new, I am kinda curious how they did it. My setup will more than likely be the 302 spec option since I don't really think a 4.6 would do all that well in CMC. Thanks. Actually, the PI (99+) 4.6 does really well. I had 252/292 with a restrictor and 255/295 without it.The restrictor didn't do much so I just left it in and set the weight accordingly. Tony's car was about the same unrestricted. The only mods on my stock 60k engine is pullies and open exhaust. Stock timing and stock paper air filter. Quote Link to comment Share on other sites More sharing options...
Members Al F. Posted January 26, 2007 Members Share Posted January 26, 2007 I'm with Kevin, I think the 4.6 is a great little motor for CMC. Quote Link to comment Share on other sites More sharing options...
RodeoFlyer Posted January 27, 2007 Share Posted January 27, 2007 The 5-liter motors were rated at 225 flywheel horsepower WITH accesories. Back in the old musclecar days the horsepower ratings were without. A well built/tuned bone stock 302 HO will make over 300hp if you do it right. I wouldn't spend that kind of time and expense for this level of racing. I'm just saying it can be done. I learned a lot working on a couple NHRA Stock Eliminator cars. Except for the typical Ford itty bitty valves the factory heads are pretty good and the factory cam is more than most peole realize. It just idles smoothly because it has something like a 117 degree lobe seperation. If you add the approved 1.7 cobra roller rockers you're at .471 lift - not bad for a factory motor. Quote Link to comment Share on other sites More sharing options...
mcmmotorsports1548534724 Posted January 28, 2007 Author Share Posted January 28, 2007 I'm with Kevin, I think the 4.6 is a great little motor for CMC. What about a Non-PI Head 4.6, would that work? I have access to one, probably for free, just didn't consider it cause I thought I would be waisting my time and money swapping it in. See, I can't backdate a 99+ PI motor in a '96 since it never came with one. Quote Link to comment Share on other sites More sharing options...
King Matt1548534716 Posted January 28, 2007 Share Posted January 28, 2007 Why not? There are people running 5.0s in 99+ cars, so why not swap the 4.6s back and forth? You could also swap just the heads, if you are a masochist and want to rebuild a mod motor. Quote Link to comment Share on other sites More sharing options...
mcmmotorsports1548534724 Posted January 28, 2007 Author Share Posted January 28, 2007 Why not? There are people running 5.0s in 99+ cars, so why not swap the 4.6s back and forth? You could also swap just the heads, if you are a masochist and want to rebuild a mod motor. 8.4. Update/Backdate Body ComponentsOEM body components, unit body, and subframes may be updated/backdated only within the years, make and model groups as follows: 1. 1982-92 Chevrolet Camaro (all submodels eg – RS, Z28, IROC etc) 2. 1993-2002 Chevrolet Camaro (all submodels eg – RS, Z28, SS etc) 3. 1979-93 Ford Mustang (all submodels including Saleen models) 4. 1994-98 Ford Mustang (all submodels including Saleen and Roush models) 5. 1999-2004 Ford Mustang (all submodels including Saleen and Roush models) 6. 1979-86 Mercury Capri 7. 1982-92 Pontiac Firebird (all submodels eg Formula, Trans-Am, WS6, etc) 8. 1993-2002 Pontiac Firebird (all submodels eg Formula, Trans-Am, WS6, etc) It doesn't say anything about using 99+ heads in a 96 though. Quote Link to comment Share on other sites More sharing options...
Members Al F. Posted January 28, 2007 Members Share Posted January 28, 2007 Read rule 8.3, which applies to NON-body components Yes, you can run the non PI heads etc, though I would reconsider that. The 99+ cars got a really good boost in power so they can restrict down to their weight, or fatten up to their power. That's the package Kevin and Tony have been running and its pretty sweet. Quote Link to comment Share on other sites More sharing options...
mcmmotorsports1548534724 Posted January 28, 2007 Author Share Posted January 28, 2007 Read rule 8.3, which applies to NON-body components Yes, you can run the non PI heads etc, though I would reconsider that. The 99+ cars got a really good boost in power so they can restrict down to their weight, or fatten up to their power. That's the package Kevin and Tony have been running and its pretty sweet. Yes, I know all about the 99+ cars, I have a '04 GT that does pretty good. I wouldn't attempt the non-pi race car route, if I did a 4.6, it would have to be a PI head motor. Thanks for the input and clarification. Quote Link to comment Share on other sites More sharing options...
GT4Point6 Posted January 28, 2007 Share Posted January 28, 2007 One thing that will come from putting PI heads on the non-PI short block, assuming stock pistons, your compression ratio goes up to around 11:1. The 96-98 had a small dish in the piston and larger combustion chamber in the head, the 99+ is just the opposite, larger dished pistons and small comustion chamber. From what I've seen, it doesn't make much more power than a stock PI motor this way, it probably would though with a cam set up for higher compression. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.