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TR4/4A 86mm vs 87mm liners/pistons - TR4

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MrAlex

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I am a little confused. Vendors are selling both 86mm piston/liner sets and 87 mm piston/liner sets. Same price. Why would I order the 86mm ones? I am missing something on why both are offered. For a TR4. I would appreciate opinions.. thanks
 
glemon

glemon

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86mm is standard size as I assume you know, I suppose if your fixated on stock you might want to stay there. But if the theory is more is better get the "big bore" pistons, they are usually a higher compression ratio as well. I got the 87mms for my 4A and it was a really sweat engine with nice power after that. 2nd gear from about 2500 to 4000 was especially nice.
 
TR3driver

TR3driver

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For awhile you couldn't even get the 86mm sets, as everyone wanted the 87s. But I guess there are enough purists now that they are making the 86s again. Should give you just a bit better fuel mileage; and as noted a slightly lower compression ratio (think regular gas instead of premium).

Not everyone is a hot rodder /bcforum/images/%%GRAEMLIN_URL%%/grin.gif

Randall - with a set of 89mm pistons & liners just itching to go in an engine
 
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