Rennlist - Porsche Discussion Forums
Page 4 of 12
1
2
3
4
5
6
7
8
9
Last »
Show 500 post(s) from this thread on one page

Rennlist - Porsche Discussion Forums (https://rennlist.com/forums/)
-   944 Turbo and Turbo-S Forum (https://rennlist.com/forums/944-turbo-and-turbo-s-forum-72/)
-   -   High Flow, Low Cost, 8V Cylinder Head Project (https://rennlist.com/forums/944-turbo-and-turbo-s-forum/700918-high-flow-low-cost-8v-cylinder-head-project.html)

Paulyy 06-11-2012 12:57 AM
It looks like they're seated in low

333pg333 06-11-2012 02:44 AM
Originally Posted by refresh951 (Post 9600520)
Thanks Patrick. Your pic has what I would consider a smooth surface. Your pic is exactly the surface finish I an shooting for. Where did the 4 valve head come from?
Oh just another project lying around.

FBIII 06-11-2012 08:31 AM
Originally Posted by refresh951 (Post 9601896)
This head in this picture was done for Alain by Parker in Canada. Anyone know anything about it. Looks like something is going on around the intake valves in the chamber but hard to tell.

http://www.refresh951.com/Parker.jpg
It would appear that the intakes in this head are too big. The valves are almost touching the side of the combustion chambers.

refresh951 06-11-2012 09:17 AM
Originally Posted by Paulyy (Post 9602135)
It looks like they're seated in low
Yep, that's what it looked like to me too.

Originally Posted by FBIII (Post 9602402)
It would appear that the intakes in this head are too big. The valves are almost touching the side of the combustion chambers.
Yes, it appears like a lot of shrouding, but word is this was an awesome flowing head.

333pg333 06-11-2012 09:48 AM
Originally Posted by refresh951 (Post 9601896)
This head in this picture was done for Alain by Parker in Canada. Anyone know anything about it. Looks like something is going on around the intake valves in the chamber but hard to tell.

http://www.refresh951.com/Parker.jpg
https://rennlist.com/forums/944-turb...-7l-16psi.html
Still don't believe 450whp a@ 16psi but by all accounts it's a fast car.

refresh951 06-11-2012 07:29 PM
Originally Posted by 67King (Post 9602075)
By the way, I should also advise you that you need to make sure those are 1 piece valves. The majority of cheap valves are 2 piece, where the head is friction welded to the stem. Not as big of a deal in an NA application, but there's a lot more heat in a boosted application.
The VTM intake valves are 1 piece, made from 21-4N Stainless Steel.

67King 06-11-2012 07:46 PM
Originally Posted by refresh951 (Post 9603957)
The VTM intake valves are 1 piece, made from 21-4N Stainless Steel.
:thumbup: Good stuff!

alxdgr8 06-11-2012 09:14 PM
Originally Posted by robstah (Post 9604102)
Great link. I especially like his Helmholtz resonator research. Thanks!

Is the BMW engine you linked a stroked/bored M52, or is it a M54? It's hard to tell from the pictures. Supercharged, I take it.
+1, good reads. I did a Helmholtz/perforated absorber project in college. Always fun to mix my job in acoustics with my hobby of cars.

67King 06-11-2012 09:42 PM
Originally Posted by robstah (Post 9604102)
Is the BMW engine you linked a stroked/bored M52, or is it a M54? It's hard to tell from the pictures. Supercharged, I take it.
Naturally aspirated, stock bore and stroke 3.0L from a 99 328. This car:

http://www.racersedge-inc.com/racers....nsf/REBMW.jpg

V2Rocket 06-11-2012 10:32 PM
How much material did you remove?

refresh951 06-11-2012 10:48 PM
Finished cleaning up the exhaust ports. Three of the liners were off about 0.030"-.040" as show in the "before" picture below. Also cleaned things up a bit at the header interface.

http://www.refresh951.com/ExhaustPorts.jpg

refresh951 06-11-2012 11:02 PM
Originally Posted by V2Rocket_aka944 (Post 9604421)
How much material did you remove?
The intake: I removed casting lines, defects, machining marks and smoothed the surface, generally without changing the geometry of the ports. I also port matched the intake manifold. The new seats go in tomorrow and the plan is to look at the intake ports again after for final blending.

The exhaust: I cleaned up misaligned liners as shown above and cleaned up a bit of casting defects around the inside of the header interface.

The plan is the remove about 1mm from the combustion chamber wall to un-shroud the intake using a mill.**

**NOTE: I am able to un-shroud the intake in this way as my cylinder bore is just over 102 mm.

refresh951 06-11-2012 11:53 PM
Deleted: Reported spammer

blown 944 06-12-2012 12:31 AM
looks like you're getting there

refresh951 06-12-2012 12:40 AM
Originally Posted by blown 944 (Post 9604737)
looks like you're getting there
Yep, and with only one arm too. LOL

Thanks Sid.


All times are GMT -3. The time now is 01:14 AM.
Page 4 of 12
1
2
3
4
5
6
7
8
9
Last »
Show 500 post(s) from this thread on one page


© 2024 MH Sub I, LLC dba Internet Brands