Tom,
I have the entire engine. After examination I discovered the single valve
springs and other numerous differences between an R head and an H20 head.
The exhaust ports are more restrictive as well as the intake. The head is
thicker with more webbing and a completely different thermostat housing in
the front.
The biggest surprise was the shape of the combustion chambers as they are
smaller but I do believe deeper. The R chambers are like the letter "B"
however the chambers for the H head are like an egg but bigger by the
intake.
The H head also does not have the bottom stud for the intake manifold.
The H block has more webbing and the front valve timing cover is pressed
steel and the oil pan is much smaller but I intend to use a 2L pan. The
pistons are dished also giving low compression which I will have to replace.
The crank has the 1600 bolt pattern for the flywheel. Interesting.
Mike
----- Original Message -----
From: "Thomas Walter" <twalter@austin.rr.com>
To: "datsunmike" <datsunmike@nyc.rr.com>
Cc: "Datsun Roadster List" <datsun-roadsters@autox.team.net>
Sent: Thursday, February 22, 2001 1:43 PM
Subject: Re: H20 Head
> H20 is the forklift motor.
>
> I am under the impression it is a near identical bolt on for
> the R16 engine. Only difference is they fitted a single weak
> valve spring on the H20 motor to keep the rev's below 1,500
> rpm. I have yet to hear of a H20 having any problems reving
> to a higher (6,000 rpm) limit in a roadster.
>
> Where did you find the head? I'd recommend getting the compete
> engine if possible. H20 uses the "stroked crank" and U20 rods
> and pistons. Pretty nice, and torque, engine for the roadster.
>
> Tom
>
>
> datsunmike wrote:
> >
> > Has anybody used an H20 head on the Roadster or know anything about them
and
> > whether they can be used?
> >
> > Mike
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