[Healeys] AH100 v's A90 Engines.

Larry Paterson Larry at patersondesign.ca
Thu Aug 9 14:48:15 MDT 2018



Aside from the distributor bolt difference you note and perhaps the casting
date, I have found no other differences in the 100 and A90 blocks.   If fact
the race motor in my 100 is an A90 block with all 100 internal parts and  it
works great.


Larry Paterson


From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of
Sent: Thursday, August 9, 2018 9:40 AM
To: 'Austin Healey'
Subject: [Healeys] AH100 v's A90 Engines.



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.


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