88" to 95" build - how does this look
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Road Warrior
Joined: Jan 2008
Posts: 1,549
Likes: 18
From: Upstate SC
88" to 95" build - how does this look
I have a bike that I recently acquired that has a 88" TC that was upgraded to a 95". I have never done a big bore upgrade myself but have been researching the components used on the forums and it looks like quality parts were used. I'm not sure how well they work together or if I should look to change any of it. Thought I would post the information here and solicit input from the experts!
The bike is a 2001 Heritage, carb, stock headpipes with Cycle Shack slipons, and SE AC. Bike had 16K on original 88" and now has another 16K on this build.
The following parts were used in the 95" Big Bore upgrade:
Bike runs well overall. It does kick back sometimes on cold starts. How does this build look? Would the compression be OK for the cam installed? I always see cautions about the tensioners but this has been taken care of on this bike with the gear driven cams. Anything else I should check?
All input appreciated as this is new territory to me.
The bike is a 2001 Heritage, carb, stock headpipes with Cycle Shack slipons, and SE AC. Bike had 16K on original 88" and now has another 16K on this build.
The following parts were used in the 95" Big Bore upgrade:
- Feuling 7000 Oil Pump High Volume
- Andrews 37G Gear Drive Cam
- Andrews 4 Gear set for Gear Driven cams
- S&S Cycle Gear Drive Cam Installation Kit
- Feuling Valve Lifters, Tappets
- Feuling 8000 Cam Plate 99-06 Twin Cam Gear Drive
- Feuling HP+ and Race Series Adjustable Pushrods
- Twin Tec TC88 Twin Cam Ignition
- Port and Polish Valve Job
- Twin Tec Twin-Cam Coil
- Harley Softail Vertical Mount Oil Cooler
- SE Plug Wire Kit, Black
- Cometic Top End Gasket Kit
Bike runs well overall. It does kick back sometimes on cold starts. How does this build look? Would the compression be OK for the cam installed? I always see cautions about the tensioners but this has been taken care of on this bike with the gear driven cams. Anything else I should check?
All input appreciated as this is new territory to me.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,090
Likes: 7,610
From: Poolville
it's a big improvement.
Without knowing the compression it's hard to tell. Although that cam was designed for basically a stock 88. 9-9.5:1, Don't know what the piston deck hieght is or the squish or even the head gasket thickness as well as your combustion chamber sizes which are all used to calculate your compression. Obviously with everything that was done I would think it's within the proper parameters. You can do a cold compression test and if both cylinders are equal and around 165-170 it should keep you in the ball park..I would think that build would yield 80-85 hp. Pretty good reliable build....
6th Gear
Joined: Jun 2010
Posts: 10
Likes: 0
From: Eastern Iowa United States
Im looking to do something very similar with 98" kit and 10.5 comp pistons. Hoping that the stock size combustion chambers and head gaskets will actually give that much compression on an 04 fatboy. Will do some checking though.
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