if your timing is way off you won't have vaccum to suck the gas in..maybe
your distributor is way out..
Racer Bud
----- Original Message -----
From: "George Harmuth" <harmug@us.ibm.com>
To: <fot@autox.team.net>
Sent: Sunday, April 25, 2010 12:23 PM
Subject: [Fot] No vacuum after Spitfire engine rebuild
> Time query the collective again. My son and I just finished a rebuild of
> his 72 Spitfire (1296, large journal) and I can't get it to run. The car
> will start up on starting fluid but won't even fire on it's own. Confirmed
> fresh gas to carb, gas in fuel bowl, disassembled carb, cleaned and
> inspected, looks OK and was working (rebuilt last summer) before engine
> rebuild.
>
> Think I've tracked it down to no vacuum, either from the vacuum port (flat
> 0 reading on gauge, no fluctuations ) on the carb or gross check, putting
> my hand (or carb sync gauge) over the mouth of the carb. I've removed the
> carb and intake manifold, gaskets etc all look good. Removed the valve
> cover and plugs, verified ( multiple times) cam to TDC on cylinder 1
> positions. The valves open in the correct sequence with respect to the
> piston position, rechecked the valve clearance, are all set to .015.
> Compression is a little low (1-4, 110.115,118,115) but the engine has less
> than a minute of run time, I expect it will rise a bit as it breaks in.
>
> The engine was working before the rebuild but it had low (ave 70Lbs)
> compression on 3 cylinders. I found 3 broken top rings, I suspect the PO,
> who had the car sitting for years, didn't do a proper job when he re fired
> the motor before he put it up for sale and the rings broke. The block was
> clean, looked like a recent (milage wise) rebuild on it but we replaced
> rings, bearings, new valves and springs etc.. The cylinder bore was
> inspected, measured and honed. The only parts not stock were a little
> hotter grind on the cam, nothing radical and a Maniflow header to replace
> the stock manifold.
>
> Any idea where I screwed up or what I can check before I do a teardown?
>
> thanks
> mike
>
>
>
> G. Michael Harmuth
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