I think folks tend to forget that the "comp" manual may have been written
with full race cars in mind. Cars that don't need to be cold started or run
for more than 1 hr at a time. Cars that run race fuel and have their engines
torn/inspected periodically.
I'm confused about the cooling/heating of the manifold:
-How does the manifold stay cooler(d) without coolant flow AND the extremely
hot exhaust headers mm's away? Wouldn't you need that coolant to transfer
the exhaust heat away?
-----Original Message-----
From: datsun-roadsters-bounces+gogineni.alvin=gene.com@autox.team.net
[mailto:datsun-roadsters-bounces+gogineni.alvin=gene.com@autox.team.net] On
Behalf Of Stephen Wan
Sent: Tuesday, March 11, 2008 4:31 PM
To: Richard Brown; Datsun Roadsters
Subject: Re: [Roadsters] U20 Head water passages
Depends where you live and the weather conditions. If you drive in the
cold, I'd leave them open. A warmer manifold will help with fuel atomization
in cold weather. If you're in perpetual summer like socal, leaving them
closed won't affect driveability. The comp manual recommends closing them,
because a cooler manifold, means cooler intake air temperature and thus more
air molecules in the cylinder yielding more power.
Steve
70' 1600
just taking up space in the garage.
----- Original Message -----
From: "Richard Brown" <reblues@reblues.net>
To: "Datsun Roadsters" <datsun-roadsters@autox.team.net>
Sent: Tuesday, March 11, 2008 4:04 PM
Subject: [Roadsters] U20 Head water passages
>I am cleaning up and assembling a U20 engine. The water passages from the
>head
> to the manifold have never been opened. I have searched and found
> recommendations for having them open and closed.
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