The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: Resto-Rob on 29.06. 2014 18:25
-
Hey guys,
Since i am forced to rebuild half my 53 plungers engine i was thinking i might as well have a bit of fun with it.
I currently have low compression pistons and have been thinking about running standards insted.
And yes, i have thin flanged barrels, hence the hesitation to just bung them in.
What do you guys think?
Is it safe to run the standard pistons or should i stick with the low comp?
I am just looking at improving the crusing speed a fraction.
Cheers :)
-
G'dat Rob.
7.5:1 and a 356 cam would be a safe upgrade.
Cheers
-
I agree with Musky.
-
I would also recommend that combination. You will still have a nice smooth engine but with just that bit more go.
-
Brillient! Then thats the way i will go :)
Thanks guys! :)
-
I am finally ready to start my rebuild!! But first another complication made me question the "power" upgrade... i have a SJ crank that has been taken down to -40. Is it still recommended to up the compression?
-
I don't think it would be a problem for day to day riding, just don't try to do the TON too often!!
My A7SS racer had a SJ crank running 13:1 on methanol and reved to 8k. In 9 years only broke 3. *problem*
Cheers
-
Speaking of low compression pistons (6:1) , is there anywhere where these can still be bought or is anyone reputable making them ?
-
Why would you want them? I think that they were 6.5:1 and were suited to the low octane fuel of the day.
Eventually BSA went to the flat top 7.25:1 pistons as standard which are quite suitable today.
Trev.