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Main : Members a15 racecylinderhead

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a15 racecylinderhead
a15 racecylinderheadPopular
SubmitterDatsun100ATurboMore Photos from Datsun100ATurbo   Last Update2004/2/4 6:43    Tell a friendTell a friend
Hits3544  Comments6    0.00 (0 votes)0.00 (0 votes)
Compare the original 37mm and 30mm valves against the new 42mm and 33mm valves.    

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The comments are owned by the poster. We aren't responsible for their content.

Poster Thread
Nissan4Eva
Posted: 2005/7/10 3:05  Updated: 2005/7/10 3:05
Home away from home
Joined: 2003/7/17
From: Bridgetown, Barbados. W.I
Posts: 278
 Re: a15 racecylinderhead
Was jus looking around the site....

I'm using 42mm inlet valves on an Aseries Head.With the standard combustion chamber the valves r shourded(sp), So why not jus expand the combustion chamber by the inlet valve jus enough to give better flow? Valves should open up in a A15 block wid out out to much drama too.

Poster Thread
Nissan4Eva
Posted: 2005/7/10 3:08  Updated: 2005/7/10 3:08
Home away from home
Joined: 2003/7/17
From: Bridgetown, Barbados. W.I
Posts: 278
 Re: a15 racecylinderhead
hey jus realised it has 33m exhaust too did those valves come from a Fiat TC 8v engine(thats where mines came from ) or r they stainless steel items.

Poster Thread
killer1200
Posted: 2006/10/11 5:03  Updated: 2006/10/11 5:03
No life (a.k.a. DattoMaster)
Joined: 2004/5/28
From: Adelaide, South Australia
Posts: 1817
 Re: a15 racecylinderhead
There way to big.

I'm think 40 and 32 would work the best with getting the air to flow in the ports ect.

Poster Thread
Dodgeman
Posted: 2004/6/11 12:28  Updated: 2004/6/11 12:28
No life (a.k.a. DattoMaster)
Joined: 2003/6/27
From: Southern Tablelands N.S.W. Australia
Posts: 8287
 Re: a15 racecylinderhead
So, .....
Some is good,
More is better,
Too much is just that, too much, no matter how you look at it

Poster Thread
phunkdoktaspok
Posted: 2004/6/11 12:35  Updated: 2004/6/11 12:35
No life (a.k.a. DattoMaster)
Joined: 2002/9/23
From:
Posts: 2809
 Re: a15 racecylinderhead
nothing ventured, nothing gained,
Experimentation plain and simple

Poster Thread
Dodgeman
Posted: 2004/6/11 22:59  Updated: 2004/6/11 22:59
No life (a.k.a. DattoMaster)
Joined: 2003/6/27
From: Southern Tablelands N.S.W. Australia
Posts: 8287
 Re: a15 racecylinderhead
That is of course true, but these engines have been around for a while now, & people have done many things with them.

Most of what has been learned is now available for the asking [free] so sometimes, experiments can be like re-inventing the wheel.
The downside can be spending a lot of cash to find that there was no real benefit. What's worse, is discovering that this was well known for years.

Hopefully, this photo just shows a couple of valves placed in the hole for eyeballing. A very wise move.

Poster Thread
Foetus
Posted: 2004/6/11 12:00  Updated: 2004/6/11 12:00
Just popping in
Joined: 2004/6/7
From:
Posts: 2
 Re: a15 racecylinderhead
42mm valve comes very close to the edge of the cylinder wall or to the combustion chamber. The close proximity of these surfases near the valve head increases flow restriction and reduces flow. There may be little or no increase in flow. In some cases larger valves can actually reduce low- and mid-lift flow. 40mm intake valve might be better choice.