Team.
Many thanks for the prompt responses and shared wisdom.
Alan
From: Alan Seigrist [mailto:healey.nut at gmail.com]
Sent: 10 August 2018 08:28
To: Alan Bromfield
Cc: Healey list
Subject: Re: [Healeys] AH100 v's A90 Engines.
Alan -
I have both cars. That's basically the only difference. The A90 also uses a
mechanical pump which is on the left front of the block, generally works pretty
well except it is susceptible to vapor lock being below the manifolds, so the
truck from old A90 guys is to wire a piece of wood to the fuel line that acts
as a heat sink and then no more vapor lock!
Cheers,
Alan
On Fri, Aug 10, 2018 at 1:00 AM Bluehealey <bluehealey at gmail.com> wrote:
Team.
I have both an AH100 and an A90 engine sat side by side on my garage floor. It
is known that the AH100 was developed to take advantage of the A90 Atlantic
mechanicals and therefore I assumed that the A90 and AH100 engines were
essentially the same.
When externally comparing these two engines there is a minor difference between
them that surprises me. The AH100 distributor mounting base on the block has
bolt holes tapped into bosses each side of the distributor hole. The A90 has a
single boss and a single tapped hole.
This indicates to me that the AH100 engine had its own block casting at the
very least, and perhaps other variations too.
Could someone advise if there any other significant differences between the
AH100 and A90 engines?
Many thanks.
AlanB
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