Compression Ratios

[Mike_S]

Does anybody know what the compression ratios are for the mk1 172?

And, in terms of tuning, what is realistic in terms of engine strenght. These guys doing T/Bs and turbo conversion, what will that do to the engine? Are the engines strong enough to withstand a good amount of tuning?

Ta!
Mike

 

[edde]

So long as rpm isn't increased and fueling and ignition are set right and det etc is checked for the mods there no issues.

Higher red line can affect the life if its used in race situations.

11.2 Cr though.

 

[Fred@BTM]

the only problem with rpm on the F4R's is 2 fold, one problem is the top end, and the second is the rod bolts, they can both manage 8000rpm "safe" (sort of, to a point) but the engine won't see more than 60K

 

[matty w]

the bottem end needs balancing to withstand extra rpm ideally as the engine is mass produced and will be out

 

[Fred@BTM]

they're actually not bad matty! surprisingly!

 

[matty w]

they're actually not bad matty! surprisingly!

just what i was told by nick

 

[Fred@BTM]

well i'm on about 172 cup engines here, out of the ones we've built they've only needed tiny tiny adjusment