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128vw
Samba Member
Joined: April 05, 2006
Posts: 222
Location: Western Massachusetts
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 Posted: Tue Dec 25, 2007 12:17 pm Post subject: head cc |
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| I,m building a 1914, 94X69. I have a pair of 043 heads with 40-35.5 valves. I measure the cc's at 48. Does this sound right? I have a deck of .122 and this gets me a 7.9/1 comp. Would I have to cut the heads .030 to get to 8.5/1. I have a engle 110 cam and 40idf carbs. |
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iltis74
Samba Member
Joined: November 20, 2003
Posts: 826
Location: Anchorage, AK
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| Posted: Tue Dec 25, 2007 1:05 pm Post subject: |
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| They could be 48cc, though that's not a lot. You're math is right, but to get to 8.5 you need to either take .030 off the deck height, or drop the heads to 42cc. I would leave the heads alone. |
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vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15303
Location: Deep in the 405
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| Posted: Tue Dec 25, 2007 1:15 pm Post subject: |
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With the W110 cam I would leave the compression at 7.9. You will not gain any notacible amount by increasing it to 8.5
_________________
2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK
Featured in Dec. 2001 HOT VW's Magazine page 63
Watch my racing video's http://www.youtube.com/user/okvwracer/videos |
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128vw
Samba Member
Joined: April 05, 2006
Posts: 222
Location: Western Massachusetts
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| Posted: Tue Dec 25, 2007 1:17 pm Post subject: |
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| To lower the deck do I cut the top or the bottom of the cyls or machine the case? Thanks for the reply. |
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vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15303
Location: Deep in the 405
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| Posted: Tue Dec 25, 2007 5:31 pm Post subject: |
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Always modify the cheapest part. The cylinders cost less then the case, so you should shorten the cylinders. If you screw it up, it is cheaper to buy a new set of cylinders then a new case.
_________________
2017 Street Comp Champion - Thunder Valley Raceway Park - Noble, OK
2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
1997 Sportsman ET Champion - Thunder Valley Raceway Park - Noble ,OK
Featured in Dec. 2001 HOT VW's Magazine page 63
Watch my racing video's http://www.youtube.com/user/okvwracer/videos |
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[email protected]
Samba Member
Joined: August 15, 2002
Posts: 4394
Location: Brew City
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| Posted: Wed Dec 26, 2007 8:42 am Post subject: |
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| vwracerdave wrote: |
| Always modify the cheapest part. The cylinders cost less then the case, so you should shorten the cylinders. If you screw it up, it is cheaper to buy a new set of cylinders then a new case. |
X2 |
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128vw
Samba Member
Joined: April 05, 2006
Posts: 222
Location: Western Massachusetts
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| Posted: Wed Dec 26, 2007 9:52 am Post subject: |
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Can I just chuck up the cylinders in my lathe and take off .030 from the top?  |
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miniman82
Samba Swamp Donkey
Joined: March 22, 2005
Posts: 9515
Location: Southern Maryland
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| Posted: Wed Dec 26, 2007 11:17 am Post subject: |
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I turned .030" off the botoms of mine with a brake lathe. 
Tedious, but effective.
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