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General Category => General Discussion => Topic started by: lazlokovacs on October 18, 2018, 02:23:31 PM

Title: measuring squish and threebond in place of gasket
Post by: lazlokovacs on October 18, 2018, 02:23:31 PM

Hi all,

Got a spare 1100 engine on the bench.

Squish measured at .070  -.074

optimum is .040 or so I've read

Means I can lose a bit of cylinder height

I measured the base gasket at .025

Can I use threebond in place of the base gasket?

And will it get my squish near enough, or should I be looking at milling the cylinders?

Cheers

 :thumb:

Title: Re: measuring squish and threebond in place of gasket
Post by: John A on October 18, 2018, 05:26:36 PM

Yep, that's the "quick and dirty" way to do it and it works well. I used some flange sealant by Locktite but Threebond is good stuff too.

Title: Re: measuring squish and threebond in place of gasket
Post by: lucian on October 18, 2018, 06:42:51 PM

 Was the squish not in spec originally?  Did you measure with the head torqued down ?   Just curios.  Perhaps thinner head gaskets are available.

Title: Re: measuring squish and threebond in place of gasket
Post by: lazlokovacs on October 19, 2018, 04:45:01 AM

yes I measured with the heads torqued down

Title: Re: measuring squish and threebond in place of gasket
Post by: lucian on October 19, 2018, 06:04:11 AM

If you drop the cylinder be sure there is not excessive wear  on the bores or a ridge at the top of the piston travel. It is better to plane the head as it wont change the wipe area of the bores. I don't know what the spec is for squish on the 1100s but .070 doesn't seem extreme. I would run it see how it goes. Easy enough on a guzzi to pull the heads and plane them it you get a lot of pinging. ( detonation)