Lowering Compression on Johnson 135

[Bunky1267]

I have an older Johnson and I hear talk of lowering the Compression on it by changing the heads with Johnson 115 Heads. Is this something I should think about ??

 

[wilde1j]

Re: Lowering Compression on Johnson 135

Why? Are you in an underdeveloped country with crappy gas?

 

[Bunky1267]

Re: Lowering Compression on Johnson 135

No here in the US maybe they were wanting to run lower octane fuel ??

 

[wilde1j]

Re: Lowering Compression on Johnson 135

Just run 87 octane and don't worry about it. Your heads are fine.

 

[kenmyfam]

Re: Lowering Compression on Johnson 135

I certainly would not consider doing anything like that especially if there is no real reason for it. I have heard of some folk putting 2 head gaskets on to achieve the same thing but still don't really know why !!!

 

[Bayou Native]

Re: Lowering Compression on Johnson 135

I'd trade you my 115 heads for yours, I'm looking for more compression.