Lizard928

Greg B,

I would be interested in the parts needed for a 5.0L bottom end that I could spin to 8000RPM!
Do you have an idea of a timeline?

hacker-pschorr

Here is a 944 16V engine than sees 8k

https://rennlist.com/forums/924-931-...for-400hp.html

400chp from a N/A 944 engine - incredible!!!

Dyno results in post #122

GregBBRD

Chevy horsepower has always been cheaper than Porsche horsepower....no one is going to ever debate that. Hell, how much was an '87 Camaro, compared to an '87 928? Please note that I'm not building an restoring Camaros....I'm doing 928s. I've also got very few (read as: no) customers that want a Chevy engine installed into their 928. The majority of my customers want added 928 power, without being able to "detect" that extra power by looking at the engine. They are Porsche people...not Chevy people.

Something interesting to think about.....building thousands of one thing always costs less than building a "few" or "one". However, when one gets beyond the "stock" Chevy parts....a "trick" 4340 crankshaft costs the same for a Chevy as it does for a Porsche....most times more. At that point, it's all about material and machine costs.....and the machine doesn't really care if the flywheel bolts are threaded metric. Therefore a 5.0 crankshaft, versus a 5.4 crankshaft, versus a 6.5 liter crankshaft are all going to cost almost the exact same amount....as long as the material, the design, the machining, and the heat treating all remain the same.

There's a large pile of almost new 5.0 crankshafts sitting around...they very seldom go bad, in a street application. Hell, I've got a big shelf of them, myself. Mark Anderson has so many, he now recycles them. Therefore, it really makes very little sense to make a "new" design 5.0 crankshaft does it?

Perhaps not.

However, there's a really small market, out there, that don't want/can't afford a "full out" stroked 928 engine. I've got these customers. However, they can afford a "mini-stroker"...especially if their engine is already apart for a rebuild. There's also people that want to see what they can do with a stock bore and stroke engine....Dennis and Jim Morton come to mind, instantly. These people want/need a solution to the "stock Porsche crankshaft issues". Jim and Dennis have already had a rod bearing failure, right? And making the power that they are making....they have to have added timing....so it is only a matter of time until it "pounds" out another set of "soft street" Porsche rod bearings". These guys and almost everyone else that is using a 5.0 engine in a high performance application need a solution to the "stock crank problems."

I've got that solution, being machined.

BC

So you are going to be using "other" rod bearings for your "other" crank/rod combos?

GregBBRD

They are being built. About 6 weeks, from where we are at.

GregBBRD

Don't think it would be silly not to, knowing what we do about stock rod bearings?

It creates the need for a custom connecting rod, but the 5.0 rod is pretty heavy and not really made to turn higher rpms and the 5.4 rods have well known "issues" anyway.....

UncleMaz

Before I die, I hope I can have Greg Brown breath on my motor.

Aspkiller

It seems that in order to have these types of discussions, some parameters need to be set. So, I'm going to start a new thread titled "Porsche Race Track Engines vs Chevy Race Track Engines." Hopefully, discussions about street car and DE track usage will not be included. Until you strap on some R compound rubber and push the g force limits of the car, you don't really know what your engine will do.

Not suggesting that anyone abandon this thread, just hoping that experienced racers and builders can have a straight forward discussion about race engines.

928er

The problem is that there are only a handful of people on here that have built one 928 engine much less more, and even fewer that have built any number of chevy engines.... I'm not a pro, (a long way from it) but I have put together several 928 engines. Some stock, and some not. The lack of choices in regards to internal components and lower productions numbers makes 928 engine specs really hard for "internet engineers" to have much to work with.... and I do see the irony reading posts from people debating theory's when they have never seen the inside of a 928 block... I can only feel how the pro's feel when they read most of these posts and threads... I can only multiply the face palm feeling to the 10th degree....

Cheburator

What are the issues that the 5.4 rods have? Are we talking 1R vs. 2R issues or something else?

jthwan22

It just looks like alot of work and $ to get 400hp. What is wrong with adding a super charger get 400hp within $10k and be done in a weekend?

the flyin' scotsman

"......... my customers want added 928 power, without being able to "detect" that extra power by looking at the engine. They are Porsche people...not Chevy people." GB

I'd be one of the above



6 weeks takes us into the holiday season and next years budgets, yes ......cant wait for the hp #s of:

hi revving 5.0

5.4L

6.0 and 6.5L

BC

Indeed. Just caught that in the other post and pulled it out. Very cool.

BC

Different "Strokers" for different folks.


I big engine has a very different feeling than boost. Big engine, SC, Turbo, or two combined - I'll take all options.

GregBBRD

There's no question what the answer to this is....Chevy engines have been racing for years....and Chevy people that are running Chevy engines now have all those years of research to help them. However, you don't actually think that there's not metric tons of Chevy engines that have failed, on the race track, over the years? Seriously?

The fact that Porsche chose not to "race" the 928 engine means that we are doing all the research and development, on our own. This costs time and dollars to engineer/develop pieces. Ask me how I know...

No one is saying that turning your 928 into a Camaro is a bad thing....I just don't have any customers that want to do that. Most all of my customers, when they go to a track day, are going to an event where both the engine and transmission need to be from a Porsche. My street customers aren't looking for a "kit" car...they are looking for a 928.

I've, personally, been down both roads. My "first" Porsche 911 race car had a 302 dry sumped Chevy in it that made almost 500 hp. Bulletproof. Very Fast. However, I was "limitied" in events that I could attend....and no matter what....Porsche people hated it and Chevy people hated it.

Having been down that road, I wouldn't do what you are doing, today, on a bet. I uderstand it. I understand the ecconomics of it. I just wouldn't do it.

Look where it is headed.....first the Chevy engine...now you are using a Chevy transmission.

Why fight it?

Go find a tube frame Camaro and race that....it wil be cheaper than the 928 and better.