[Stan Weiss]

Originally Posted by 60man

Looks like specs on my springs.
What lash do you run Mike....or did I miss that ? ��

When a cam is designed normally the lobe / valve lift is done and than a lash ramp is added. Depending on what the designed wanted for his lash ramp and your rocker arm ratio that tells you what the standard lash should be. Now unless you got the perfect cam, running lash loops on the dyno can show some improvement. But one setting does not fit all.

Stan

[cgeise]

Originally Posted by mike leech

As far as Pistons go. This is another area where I chuckle when I talk to people. Everyone wants to make big power, but they want to have cheap parts that are on a shelf. 1/16 inch ring packs and 3/16 oil rings are just plain gross.

Expect to pay twice as much at least for pistons as you think you are going too. You're not going to use regular parts. You're going to have to try a lot harder than that.

As far as rings go with cool guy stuff will cost you twice as much as you think Pistons are going to cost. Like $1300 as a starting point for the cool guy stuff. But even come in their own individually wrapped packages and in plastic bags inside of those packages.

I am on purpose not supplying a photograph of the top of the piston. We have worked out a dome design specific for my heads. It wouldn't do any one else any good anyway. And the point of this thread To be a little bit detailed but more general. Not just give away a recipe.

My wrist pins weigh about 190 g. They are heavy, but they also need to be. It's part of the deal. And you can get a lot cooler Pistons than what I'm currently running. But there's a budget for everything. Maybe someday I will get billet pistons. For now forged Will do.

A little confused here -- I have had to run flat top for years and still do some wiggle to stay in the mid 15:1 range --- the current "project" has a dish in it for that 15.2 is the chamber still that big to require a dome ???

[mike leech]

Originally Posted by cgeise

A little confused here -- I have had to run flat top for years and still do some wiggle to stay in the mid 15:1 range --- the current "project" has a dish in it for that 15.2 is the chamber still that big to require a dome ???

It is very small dome. And large valve releifs

[Tom Vaught]

Thanks again Mike.

Tom V.

[RA462]

Keep up the great work Mike. Dig the thread. Wish I lived closer to see it more myself. Keep it coming.

[RAMAIR RICK]

Mike, thanks greatly for sharing some of the investment realities of the high quality components that are needed in order to play in the very competitive heads up racing that you do. In addition, the high quality specialized machine work, and very high quality components, along with the correct combination of all the parts, makes for a collective whole, that is flat out one bad %*# PONCHO.

[mgarblik]

Oil pan looks like a big project. As far as pistons and rings. Looks like a .990 pin? Are you using aluminum buttons to support the oil ring or a steel support? Hard to tell from the pictures, but looks like no gas porting of any type. We don't do that either. We do use a .017 dykes top ring for some additional help with our high cylinder pressure. Looks like the top ring is about .170-.200" down from the piston head? You are right, the pistons don't look particularly exotic from the underside. Look to have good support in the skirt area. I have built 1 engine with billet pistons so far. Very expensive as you mentioned, Don't have any real feedback as to whether they were worth the cost yet. It was a late model Hemi build. Appreciate the posts!

[mike leech]

Originally Posted by mgarblik

Oil pan looks like a big project. As far as pistons and rings. Looks like a .990 pin? Are you using aluminum buttons to support the oil ring or a steel support? Hard to tell from the pictures, but looks like no gas porting of any type. We don't do that either. We do use a .017 dykes top ring for some additional help with our high cylinder pressure. Looks like the top ring is about .170-.200" down from the piston head? You are right, the pistons don't look particularly exotic from the underside. Look to have good support in the skirt area. I have built 1 engine with billet pistons so far. Very expensive as you mentioned, Don't have any real feedback as to whether they were worth the cost yet. It was a late model Hemi build. Appreciate the posts!

I built the pan in about 30ish hrs over 4-5 days.
The ring is there due to the depth of the valve releif. Where the ring land comes close to the valve pocket. We would like it higher. But....

.927 pin.

[mgarblik]

I kind of figured that on the top ring position, but couldn't see the valve relief well in the pic. .927 pin also makes perfect sense if I would have thought about it. It allowed you to move the rod up slightly which was a goal and of course a big weight savings over a .990 pin. Of course the down side is you had to pony up for Vasco-jet or some similar material to get the strength you needed. Big RPM cost even bigger $$$. Looking at this engine, you have that routine down . Good luck with the project.

[cgeise]

cool

[Gary H]

Best, quality thread we've had on here in a long time. Thanks Mike!

[Hooter]

Originally Posted by Gary H

Best, quality thread we've had on here in a long time. Thanks Mike!

X1,000....

[GTO Dan]

Mike - besides Scott who else is involved in this build? John M? Chris U?

[mike leech]

Originally Posted by GTO Dan

Mike - besides Scott who else is involved in this build? John M? Chris U?

Scott Brown is responsible for all of the internal engine components valvetrain etc. i just get with him on what we are trying to do and he makes it happen.

John Marcella is a bad dude and all things air flow. I challenge him a little sometimes in a productive way. Hes got a knack for knowing what will make the engine happy.

Really thats the INVOLVEMENT. I highly recommend both.


Chris is a great friend and a bad dude in his own right. I would say we discuss ideas and share a bit of information. He also helps out in a pinch when I need something he has access to. Like any friend would do. I think he just likes this engine because it's a freak of nature.

[GTO Dan]

Originally Posted by mike leech

Scott Brown is responsible for all of the internal engine components valvetrain etc. i just get with him on what we are trying to do and he makes it happen.

John Marcella is a bad dude and all things air flow. I challenge him a little sometimes in a productive way. Hes got a knack for knowing what will make the engine happy.

Really thats the INVOLVEMENT. I highly recommend both.


Chris is a great friend and a bad dude in his own right. I would say we discuss ideas and share a bit of information. He also helps out in a pinch when I need something he has access to. Like any friend would do. I think he just likes this engine because it's a freak of nature.

That is an impressive group (you included). The ability to toss around, discuss and debate ideas with people like that is invaluable. Thanks again for including all of us.

[tpssonic]

Originally Posted by GTO Dan

That is an impressive group (you included). The ability to toss around, discuss and debate ideas with people like that is invaluable. Thanks again for including all of us.

What he said.

[Half-Inch Stud]

Is this Thread sanctioned by the ECM?

[mike leech]

Originally Posted by Half-Inch Stud

Is this Thread sanctioned by the ECM?

LOL. Doubt it.

[dci]

Mike, This is an awesome thread and will hopefully help shed some light on engines of this caliber for those that are not normally exposed to them. These kinds of threads are very much needed in our small community. As you already know so many guy's don't know what all is involved in making even 800 HP. I know some of the build you cannot or will not expose, but please show as much as you can. Thanks for sharing !!!!

[BB70]

Very nice chamber work, I think 2.25 x 1.74 . Thanks for the look inside your engine Mike.
John