Hopefully this is a fairly simple question for the engine gurus here.

I have a twin cam 110 long block that was installed in my 2012 FLTRU in 2016. I therefore assume it is a 2016 engine. I have left it fairly stock, but it does have the SE110 heads, SE259e cams, SE 58mm throttle body, SE Heavy Breather, SEPST, and V&H Power Duals with V&H High Output slip ons.

I have been pretty happy with this combination as it currently dyno's at 113bhp and 123 Ft/lb of torque.

My main question is about the compression ratio. I have been told that this motor is 9.2:1 from the factory. That's fine. It works well. However, I have also been told that the SE259e cams prefer a bit of a compression boost to really perform well.

If I have stock 9.2:1 CR, what would I gain if I replaced the factory Head Gasket with something thinner, perhaps a 0.030" head gasket? Is it worth the effort? I would like to get closer to 10.0:1. Would I risk clearance issues with this cam and a thinner head gasket?

I still have another year on my ESP, so no work will be done before then. I'm just doing research at this point.

Any advice is greatly appreciated.

 

I suggest you do a compression test before anything else.. never assume what the comp is... Then plug the numbers into a dynamic compression calculator to figure your static comp. Then you'll have a base to figure the next step... Personally I don't believe your static is at 9.2:1. If it was I don't think you would be getting the numbers that you are..

 

Thanks. I'll do that in the next few days. I know I've seen links on the forum for calculators.

 

RB Racing website has very good calculators... https://www.rbracing-rsr.com/calculations.htm

 

cc the heads,I've seen 110 varied from 94 to 98 cc's

 

Going to a cometic thinner head gasket on that engine will net approx 0.20 points of compression.

 

Hmm... That doesn't sound too promising. Not much gain for the effort.

 

The average amount of material removed from the head gasket surface to see 10.0 cr from those heads, using a .030", gasket is .030".
To arbitrarily cut them w/o cc'ing them is a dice roll, but on the average, what we've seen here, is .030".
Once at 10.0, the door opens up to several cams.
Scott

 

Like mentioned. CC and shave to correct your compression. Biggest expense with this is gaskets to put it back together which you seem willing to do anyway. Warranty? They will never know.