Feeler: CP Pistons, Medium Comp, 10:1

phunk

Its a top secret project that I am currently about 70% confident I can complete. But I will not know for sure until I start prototyping it on the new CNC. But the projects goal is to give us an oil pump solution that will be able to handle 8-9k RPM without any real concerns. But I will add one detail right now... if I do complete this, there is going to be no way around it requiring very light modification to the nose of the crankshaft. Its an easy modification, but the crankshaft will require removing. This means engine out, timing covers and chains off. You can get the crank out with the heads on and leave the pistons and rods in there... but unless youre an NA car, you might as well do the pistons and rods once youre this deep.

I will probably start posting about it in January.

__________________

Chuck33079

Great, my "future motor build" keeps getting more and more expensive.

Keep building cool ****, man. One of these days I'm going to be writing you a fairly substantial check.

__________________
2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

phunk

More expensive? Thats the wrong way to look at it... if it saves you from broken oil pumps, it will save you money in the long run! You cant afford to not buy it!!! lol

__________________

Chuck33079

Yep. That's how I keep justifying spending money on this car.

__________________
2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

OldBoy

Count me in!!

djtodd

count me in as well

__________________

phunk

1. phunk
2. Chuck33079
3. GaleForce
4. cosmogirl
5. OldBoy
6. djtodd

OK looks like enough to me. Tomorrow I will contact CP and get the ball rolling and I will post back what we are looking at for ETA. If we are only short 1 or 2 people, I dont mind placing the order because I am sure they will sell before they are done making them.

__________________

OMGWTFBBQ

1. phunk
2. Chuck33079
3. GaleForce
4. cosmogirl
5. OldBoy
6. djtodd
7. OMGWTFBBQ

Count me in (if it's not too late)!!!

phunk

not too late for this one!!!!!

__________________

phunk

1. phunk
2. Chuck33079
3. GaleForce
4. tibal
5. cosmogirl (maybe)
6. OldBoy
7. djtodd
8. OMGWTFBBQ

I will have timeline details sorted out today!

__________________

phunk

1. phunk ; 100% in, any time before March.
2. Chuck33079
3. GaleForce
4. tibal
5. cosmogirl (maybe)
6. OldBoy
7. djtodd
8. OMGWTFBBQ

__________________

phunk

BTW I am curious if you guys are interested in this.

I have thought about constructing pistons that would be compatible with both VHR and HR cylinder heads. This means anyone who wants to make the change immediately or down the road is clear to go and will not have to do the bottom end again.

I already discussed this with CP and the conclusions we came to was that this was most likely very possible. We have to compare the valve angles between the HR and VHR cylinder heads and do a little math... but by adding some well planned exhaust valve reliefs to the pistons we could probably have a piston for the VHR bottom end with HR or VHR heads. Some research also has to be done to determine if this will or will not change the CR between one head and the other.

I was concerned about if you guys would care for this or not. I wasnt sure if people would feel there is a compromise in the pistons design to accommodate cylinder heads that they are not running. But this would sure be a lot easier on me for stocking in the future. On top of that, I am currently leaning more towards HR heads for my build, but I am not ready to commit to them yet... but I want to start my bottom end build!

__________________

BGTV8

So, if you can look at 13.0:1 in VQ37 bottom end with HR heads and 14mm peak lift I am interested (planning E85 NA engine for VQ engined sports car here in Oz). Std VQ37 stroke and rod-length. Key issue is sufficient meat on the crown to allow for valve relief .... bit off topic for this thread, BUT signalling my interest.

OldBoy

I,for one, won't be going to HR heads. I remember reading an article on the differences between the VHR and the HR and one of the things that they pointed out was that the HR head had "sharper" edges in the combustion chamber compared to the VHR. This, although it might not seem that big of a deal, could potentially cause hot spot in the combustion chamber... not exactly what you want in a high compression boosted engine.

Phunk, do you think you could work in a group buy for CP rods also? Maybe get a bit of a cheaper price from CP for the combo? Or free coating?

faceglide

PM me details please, very likely interested. Never too early to get that built block rolling.