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AlteWagen
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AlteWagen
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AlteWagen
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Joined: February 23, 2007
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 Posted: Tue Dec 21, 2021 9:05 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| QRP wrote: |
The chamber looks similar to the Berg semi hemi. |
Looks like a custom piston dome is going to be used because of the shape. I think a large dome piston for 1600 based builds sure would help the efficiency of all those semi hemi heads sitting on the shelves and even the stock type chamber design.
A domed, forged, thin ring pack piston in 88mm would be a best seller with a 92 coming in a close second. A 'B' pin height would also open up a lot more options for the 88 since they have not been available for decades
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QRP
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Joined: April 27, 2008
Posts: 1874
Location: NORTH HOLLYWOOD,CA
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| Posted: Tue Dec 21, 2021 8:33 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| AlteWagen wrote: |
Had to add this thread here for anyone working on WW Okrasa heads.
https://www.thesamba.com/vw/forum/viewtopic.php?t=757037
from the thread are the flow numbers for the WW Okrasa heads
| Alstrup wrote: |
All flow numbers are at 28"
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I might have to try machining some seats in the future! |
The chamber looks similar to the Berg semi hemi. |
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AlteWagen
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AlteWagen
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| Posted: Thu Dec 02, 2021 9:54 am Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| Johannes Persson wrote: |
Heads latest upgrade with modifications to intake throat, valve seat and chamber. Flow improved from 262.5cfm to 277.5cfm at 25"H2O or from 277.7cfm to 293.6 cfm at 28"H2O.
Very exciting!
I guess with this upgrade I have to change the name of the heads from MS250 to MS260 |
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-Alex77-
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Joined: December 09, 2008
Posts: 513
Location: Finland
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| Posted: Mon Feb 22, 2021 3:43 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| AlteWagen wrote: |
Why the change in tune Roy? you posted this in the billet head thread in direct response to a post of Remmele heads
| [email protected] wrote: |
| Der6VoltFahrers wrote: |
Some pictures of my Remmele Type 1 heads.
They have 45x40 valves and 94mm bore.
They are set up for 10,5:1 compression.
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Look at all those fins!!!!
And the air flow going right down the middle in between the cylinders!!!
Those guys definitely know what they are doing....very cool  |
Looks like more than adequate air flow through the middle of the head as you point out. A custom lower deflector plate will get the cooling air where it needs to be.
Also appears that there was some changes in the center cooling slot compared to the prototype shown above
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That is type 4 head, 12.5mm more cylinder spacing.
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AlteWagen
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AlteWagen
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| Posted: Wed Jun 17, 2020 7:43 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| MitchS046 wrote: |
| what does CFM stand for all I know it is about the flow rate but what is high and what is low? |
It is a measure of how much air can flow through a given restriction over a period of time, cubic feet per minute
Low in this case would be stock flow as a baseline (heads at top of chart)
The general thought is the HP possibility is related to the amount of max flow (200 cfm could possibly get 200HP with all things being perfect).
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MitchS046
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Joined: March 02, 2020
Posts: 114
Location: Holland
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| Posted: Wed Jun 17, 2020 3:00 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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what does CFM stand for all I know it is about the flow rate but what is high and what is low?
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slalombuggy
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Joined: July 17, 2010
Posts: 9272
Location: Canada
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| Posted: Wed Jun 17, 2020 10:56 am Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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My new Ultra Wedgies from CB have the same step.
brad |
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Mrblue01
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Joined: January 09, 2009
Posts: 18
Location: Westland, MI
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| Posted: Wed Jun 17, 2020 10:22 am Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| 57BLITZ wrote: |
| AlteWagen wrote: |
| Thanks for the pics! Can you post some of the rocker area? |
Thank you AlteWagen for this informative thread!
Bonus... detail photo of C.N.C. reworked chamber option... heads are opened for 94mm...
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I am wondering why CB heads like yours have a shallow (0.010"?) step on the deck surface? I have a set of SuprPro's that are the same. I am trying to get max compression ratio and this is working against me. Anyone know? |
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57BLITZ
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Joined: June 12, 2012
Posts: 2387
Location: DEEK - U.S.A.
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| Posted: Tue Jun 16, 2020 6:03 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| AlteWagen wrote: |
| Thanks for the pics! Can you post some of the rocker area? |
Thank you AlteWagen for this informative thread!
Bonus... detail photo of C.N.C. reworked chamber option... heads are opened for 94mm...
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AlteWagen
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57BLITZ
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| Posted: Tue Jun 16, 2020 3:37 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| AlteWagen wrote: |
| Is it just me or does it look like CBs Panchito casting? |
Comparing the photos in the link to the Panchito head I have in my hands . . . looks to be a different casting . . . many differences!
Between the intake port and the exhaust port on the Panchito head . . . 9 holes for air-flow!
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AlteWagen
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AlteWagen
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AlteWagen
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Jebchevelle
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Joined: May 25, 2019
Posts: 34
Location: colorado
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| Posted: Fri Sep 13, 2019 6:34 pm Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| [email protected] wrote: |
| Jebchevelle wrote: |
| AlteWagen wrote: |
I was only able to get one number for the L3 head from John at AC.net. I asked Johnny who was our rep from AA if they had any numbers for any of their heads and he said no.
I think that the improved flow over a stock head when comparing the L3 is due to the combustion chamber shape. All of the ports Ive measured as cast were SMALLER than a stock head.
I too would love to see out of the box flow numbers for the 500 series. |
I just purchased a set and am in no hurry maybe I could find a place to flow bench them? maybe painter's grinders in denver? I was gonna have them redo my stock heads but since the price was a wash I purchased the new heads setup as I figured I would need them. might have wasted my money time will tell, my heads need exhaust stud repairs and machine work pus the one head has a warped rail where the valve cover sits and leaks oil without a tone of sealer. was told $300 plus to fix them and put on hi rev springs. So new heads it is. I got mine with the 35.5mm intake and 32mm exhaust so may be no better then stock. |
It wouldn't be a bad idea to flow test them but you will have a few hurdles to overcome to accomplish that. One, you will need a fixture as most race shops aren't equipped to flow a VW head. I had to build my own fixture. Two, you need to recreate how all the other companies flow tested their heads as close as possible otherwise your results won't mean much. Three, you need to have another head in hand as a "test" that has published flow numbers so as to qualify the bench that you are using. Flow testing a VW head is no simple 10 min in and out of the shop job. You need to make sure your test is accurate otherwise you may be heaping undue praise or undue slander on the company whose heads you are testing. I spent many thousands of dollars and over a year and a half of time flow testing my heads before I felt comfortable publishing the results. I also bought multiple competitors heads that had published flow numbers so I could make 100% sure that the results I got on my heads were accurate. |
That is why I thought about painter's grinders they are the local vw experts here. I have no clue who else could or would do it. |
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[email protected]
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Joined: August 15, 2002
Posts: 4394
Location: Brew City
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| Posted: Fri Sep 13, 2019 7:02 am Post subject: Re: VW Cylinder Head Quick Reference Sheet |
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| Jebchevelle wrote: |
| AlteWagen wrote: |
I was only able to get one number for the L3 head from John at AC.net. I asked Johnny who was our rep from AA if they had any numbers for any of their heads and he said no.
I think that the improved flow over a stock head when comparing the L3 is due to the combustion chamber shape. All of the ports Ive measured as cast were SMALLER than a stock head.
I too would love to see out of the box flow numbers for the 500 series. |
I just purchased a set and am in no hurry maybe I could find a place to flow bench them? maybe painter's grinders in denver? I was gonna have them redo my stock heads but since the price was a wash I purchased the new heads setup as I figured I would need them. might have wasted my money time will tell, my heads need exhaust stud repairs and machine work pus the one head has a warped rail where the valve cover sits and leaks oil without a tone of sealer. was told $300 plus to fix them and put on hi rev springs. So new heads it is. I got mine with the 35.5mm intake and 32mm exhaust so may be no better then stock. |
It wouldn't be a bad idea to flow test them but you will have a few hurdles to overcome to accomplish that. One, you will need a fixture as most race shops aren't equipped to flow a VW head. I had to build my own fixture. Two, you need to recreate how all the other companies flow tested their heads as close as possible otherwise your results won't mean much. Three, you need to have another head in hand as a "test" that has published flow numbers so as to qualify the bench that you are using. Flow testing a VW head is no simple 10 min in and out of the shop job. You need to make sure your test is accurate otherwise you may be heaping undue praise or undue slander on the company whose heads you are testing. I spent many thousands of dollars and over a year and a half of time flow testing my heads before I felt comfortable publishing the results. I also bought multiple competitors heads that had published flow numbers so I could make 100% sure that the results I got on my heads were accurate.
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