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* Cylinders bored 0.020" over
* Wiseco pistoms
* SE Heads with some cleanup
* SE ignition
* Wimmer brothers air cleaner
* CV carb
* D&D Fatcat exhaust > 81hp/83tq (~ 2013)
* Thunderheader > before some of the above work was 79hp/87tq (~ 2009)
When you get around 90/90 you're starting to push the reliability limits. For a stack of hundreds you can pretty much get what ever you want, rather than push it to the limits why not go for a big inch kit ?
When you get around 90/90 you're starting to push the reliability limits. For a stack of hundreds you can pretty much get what ever you want, rather than push it to the limits why not go for a big inch kit ?
Before the Dyna was the FXR,hand made frame engineered by Eric Buell it was a great handing bike and also light weight for a big twin.
I had one for a decade and always regretted selling in 2002 it to pay off a new bagger I bought in 2000.
Fast forward to 2022 I bought another FXR as a restomod project.
The first two years were 1982/1983 with Shovel motors but the Evo will fit.
So the Evo has the exact same mounting Specifications as the shovel head engines?
Man I know lots of folk like hillside. I’ve never had any dealings with them personally but their shovelhead kit is the worst anyone wanting power could do… why on Gods green earth does anyone dual plug shovels unless their well over 12:1 mechanical compression. Once you’ve done it you’ve ruined those heads for the best street performance. Believe me shovels it’s key to get as much compression as possible with the lowest dome possible. The squish area is your best bet for power in a street shovel.. going dual plugs Immediately lowers your compression a good point. So now to get that back you have to go with a higher dome. Defeating the efficiency. After tinkering with so many of them I got my 93 inch up to 11.7:1 using the old shape S&S 1800 piston. I can run 93 octane in Florida heat with cams that don’t bleed a lot of that off without Detonation. My chambers are a nice cloudy grey when you tare down… no way I could do that with dual heads. Been there done that. And that bull that a shovel can’t make the same power as an evo under 103” If they don’t, you’re doing something wrong. Harley didn’t stop making the hemi shovel head because it wasn’t making power. They stopped making it because they couldn’t get gas that was good for it anymore. Shovelhead flow a ton of air and perform every bit as good as an Evo head. You just have to use good gas and compression.
Gonna take a break in a bit and go find my old notes.. I built a 80” shovel for someone and I’m pretty sure I have the dyno charts he sent me. It was high 80’s square. I remember it was 10.5:1, redshift 580S cam, stock heads that I ported and did a good valve job on, S&S B, dynaS and 36” drag pipes.
Dual plugs also are a place for carbon to collect creating hot spots that can detonate… the very reason many think they need to dual plug. Dual plug has its place.. flame Propagation. And you only need that when there’s a massive dome blocking that spark.
Last edited by Rains2much; Mar 25, 2024 at 09:17 AM.
Found one of my old posts with the dyno sheet - post 7. It can be pumped up but running on pump gas is a nice option. I took off the Thunderheaders and put on Supertrapp duals and am @ 87/87, the sheet for that run is in storage somewhere.
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