Under the "while I'm at it" category...
I will be replacing the head gasket some time soon (during the cool season).
Which of these two options is better? ...I have recently recently reread
all the engine mod messages that I have been saving for the past year and
tried to find www.teglerizer.com/triumphstuff/engineguide/index.html but the
link is dead.
Option 1:
I was going to take the head to an engine machine shop to have it resurfaced
before reinstalling and I like the idea of skimming to increase the
compression.
Any down side to skimming 0.060"?
How do I know it hasn't already been resurfaced - how thick should is a
stock head?
Option 2:
I have a 1296 parts motor (FE40085E) of unknown condition.
What are the advantages of using its head on my 1500?
I see from an old Joe Curry post that the inlet valves are smaller on the
old head. Enough to matter?
Is every 1296 head the same?
Anything I need to be wary of in doing this swap?
I see from Paul Telger's site that the cam specs are different - How would
this change things?
(Option 2, of course, allows me to keep driving while work is being done on
the spare head.)
I have a '79 1500 with low compression pistons and soon to have HS2 carbs,
intake and exhaust manifold from my spare motor.
Len Lubbers '79 Spitfire
Ottawa, Canada www3.sympatico.ca/lubbers
----- Original Message -----
From: "John Kipping" <johnkipping@inet.net.nz>
To: <spitfire-enthusiast@yahoogroups.com>
Sent: Wednesday, October 03, 2001 10:09 PM
Subject: Re: [spitfire-enthusiast] Re: Dolly 1500 engine in a Spitfire (now
budget 1500 hop-up)
John,
It is only worthwhile fitting the flattop pistons if you are replacing them,
otherwise the far easier way of raising the compression is by skimming the
head. Assuming standard bores then to go from 7.5:1 to say around 8.75:1....
At present 1 cylinder is 373cc, therefore head capacity is 49.75cc and
internal height is 11.67mm
Now for 8.75 head capacity will be 42.6cc and height required is 10mm, so
remove 1.5 mm or .060".
In practice the combustion chamber isn't a perfect cylinder so this won't
raise the compression by quite this much.
In the UK with enough spare cylinder heads to sink a battleship I used to
use 8.5:1 1300 heads with low compression 1500 pistons and they worked great
but I never worked out the compression ratio.
John Kipping
> ----- Original Message -----
> From: John Acuff <jacuff1@earthlink.net>
> To: <spitfire-enthusiast@yahoogroups.com>
> Sent: Thursday, October 04, 2001 12:25 PM
> Subject: Re: [spitfire-enthusiast] Re: Dolly 1500 engine in a Spitfire
(now budget 1500 hop-up)
[message deleted]
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