BayAreaEngineer

Thanks atb,

Can you point me to Sterlings dyno graphs.

dave

atb

I could, but then I'd have to consume the cyanide pill I received along with the "Official Member of the People that have seen Sterling's Dyno Chart" Club certificate I received.

Tom. M

I don't think there is any magic pill Devek put in the strokers to make em more powerful than any other. Build the motor with care and take your time on the little details..measure..check...measure...etc... Nothing glorious there.. I think Louie proved it all pretty much..take some of the old hot rodder tricks (x pipe ...ITBs) and apply them to the 928 motor..and guess what..more power...after all it is just an engine... all of course IMHO..

atb

You mean I've been sprinkling my stroker block with water shipped from a magical spring located in Belmont at every full moon for nothing? (That is truly meant as a joke, not a cut)




Adam no longer lives here, he's under Federal Witness protection after having anonomously mailed off some graphs with squiggly lines on them to the NY Times Editor.

BayAreaEngineer

Adam,

Very funny!!

You are joking right?

If not, why so secret?


Sterling, sorry you have issues...I have an email into marc@devek
(rennlist) and to a private email address ...but no response yet, been a few days. I did reference this thread, though.

Be interesting to get his side of the story though..but no loss if I don't. Just want to learn as much as possible before taking the plunge. I just want to make sure we get 400+ rwhp....

Poll - how may strokers have 400+ rwhp? (name, builder, mod list - rwhp)


With a few SC kits for the 928 that just bolt on for over 400 rwhp, make the decision hard...but I really like the all motor options.

Probably do the same poll.....

does anyone know how to do the polling thing on a this list?

dave

ShawnSmith

If you don't need to pass any kinds of emissions tests, and want hp/dollar, the decision in favor of one of the nicer supercharger kits would seem simple.

I'm nuts, and I live in California, which at least partially explains my going with the stroker. It's not a practical decision in any way, other than the fact that it's so well built it'll probably last longer than my driver's license.

atb

For sure, I am not my brother's dyno sheet keeper.

Louie928

Here is a stroker dyno sheet. It has GT cams, It has 968 intake valves, but otherwise stock intake, etc. The two lines are before and after Sharktuning. I had to back off the timing a lot as it was detonating. There were mixture changes too as it ran pretty rich before tuning.

https://rennlist.com/forums/attachme...1&d=1230615197

Tom. M

Here's some of the stuff posted from the way back machine like 2002 era.. Search for posts by "Marc@Devek" in the 928 forum and you can see what Marc was doing with his strokers..and then you can compare and contrast with what folks are doing today... good luck on your quest...


"Quoted from Marc@Devek in 2002 ish " I have been following this line for quite some time and have some comments.

Sterling's engine is made for boosting, not as a high output na engine (although it will be a "healthy" NA), hence the deck plate, grout and steel sleeve (another are that we have lots of exp with), oring, copper gaskets, etc. All are technologies developed by Bob Norwood n his quest for the 1000 rwhp 3l.

Our basic street 6.5 with no valve mods or headers puts out about 385 rwhp, add mid level heads go to 405, add headers and exhaust go to 435-440. These engine last forever! Some 928 race engines have to be rebuilt every 25 or so race hours, others have yet to be rebuilt! A decent built 6.5 will last for 100K with no lower/upper end work required. Remember, big engine pull BIG vacuum numbers.....

Throw in a DEVEK B1 cam, same grind as used in the KMR928 (while it ran) and get 680 -700hp. Use em in a stock 928, gain about 55 rwhp...but will not idle worth a damn!

We have done a few engines with stock lower ends with "big valve heads"...average gain is about 25 - 30 rwhp. We have not done a stock lower end with full p/p heads.

We have US based pistons running in two engine right now, one is far away and one on this list. We had one failure, the guy in Kansas, who washed down the cylinders with fuel and trashed a piston or two. The later two were built by a DEVEK engine builder, using our piston coating technology and different piston materials. All in search of a reliable. low cost engine options. Research takes a long time to make sure that it works for a long time! We generally build and test for 60K miles , putt it apart and see what it looks like inside before we market and sell performance engine products. Sometimes we share this testing with a customer with a discounts for the effort, just like we did with the Kansas effort. Note to self,.....

We have a block which will use the nikasil coating process...will let you know when it gets built. There are potential issues with nikasil coating...see BMW v8 technology.

Valves- 968 valves? They are actually 928 part numbers and were intended for the GTS, but the result was a bit too much hp and would directly comptete with the then current "leader of the pack" turbo. And the 968 heads are VERY different.

Hey, we have been selling 944 2 valve heads and cam towers forever and frequently offer deals on the list for them! I have reposted the offer. No secret.

Soon there will be 7, maybe 10 more of our strokers out there..with one very special Na street engine with expectation of 550 rqhp on pump gas using our DTA sequential fuel and ign control system. Louis Ott is our 928 dealer for DTA...contact him or me for more info.

Good luck with your projects and we all look forward to seeing them perform on the dyno and at the track...maybe for DEVEK day?

Maybe we should rename the topic "the quest for more horsepower continues..."


Regards,

Marc (end quote Marc@Devek )

IcemanG17

Dave
If you are serious about finding Marc and Susan I know how to get ahold of them.....PM your name-phone number and I will call them and give them your number....I don't feel comfortable just giving out someones # to a person I don't know?

I do think there is quite a few strokers out there in the 400+ whp club....the club gets MUCH smaller when you cross the 500whp barrier with only 5 that I know of.......Louie, John V, Mark A, Joe F, Tim D...so two were Devek built, 1 unknown to me & two by Doc Brown

mark kibort

no 968 valves? seems like a lot of power for just a stroker and no tuning (i.e. 410rwhp before tuning)

Why do you think my 6.5Liter engine has only 365rwhp with no tuning?
(and now more like 371 with the cams now set at 0 degrees. when they were advanced 6 degrees.)

mk

Louie928

Whoops! Big mistake I made there Mark. I should have written I think it has 968 valves. An attack of crainium rectus.

BayAreaEngineer

Louis,

Nice looking curves...who built the motor?

Dave

928autobahndreamer

I don't get what you are doing here. You know who built Louie's motor. What exactly is your agenda?

Ahh... Nevermind my mistake. I see that you are refering to the dyno sheet that Louie posted of a different motor.

John Veninger

I did my own motor build. I sent out the heads to get the 968 valve seats and valves installed after I had ported the heads and cleaned up the exhaust valves (actually did this twice .)

Really?