98
Grand HDF Member
Joined: Jul 2007
Posts: 3,740
Likes: 8,536
From: Bates County MO
Possible? Yes.
Reliable? Sure- as long as you make the right choice, and it isn't going to be cheap ( "Fast, Cheap, Reliable- pick two" )
Practical? Maybe not so much. 120 HP in a 98" motor will be a right side build. Picture a formula 1 engine in a semi
Reliable? Sure- as long as you make the right choice, and it isn't going to be cheap ( "Fast, Cheap, Reliable- pick two" )
Practical? Maybe not so much. 120 HP in a 98" motor will be a right side build. Picture a formula 1 engine in a semi
Last edited by rigidthumper; Oct 9, 2019 at 07:52 AM.
Grand HDF Member
Joined: Jul 2007
Posts: 3,740
Likes: 8,536
From: Bates County MO
Can get, or use effectively? I was able to get 150+ out of a 95" motor with a pro charger. Wasn't much good to me because it was a 1100 pound bagger, and it didn't break 100 TQ until after 3000 RPM.
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Grand HDF Member
Joined: Jan 2012
Posts: 4,459
Likes: 2,896
From: Oklahoma
More than one horse power per cubic inch starts getting quite expensive. Even if the motor were bullet proof, what ELSE are you planning on modifying? Parts engineered for about 87 horse power will only last for so long with an almost 50% increase in power output. This leads to a long, irritating "research project" into what the next weakest part will be.
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Road Captain
Joined: Jan 2007
Posts: 645
Likes: 216
From: Minneapolis
Ive got a 98 with 117 hp/ 113 ft lbs. Woods 8 gear drive cams, heads by Wes Brown. Its great in a Dyna, but I dont think I would put it in a bagger. Runs out to the limiter (6600) still at 116 hp. Wouldnt be horrible with a touring exhaust Id guess. (Low end torque wise). Static compression is 10.89.
Elite HDF Member
Joined: Jul 2007
Posts: 3,903
Likes: 1,122
From: 48.067222,12.863611
Yes, you can get 120 HP from a 98" semi-reliably IMO. I wouldn't push that far though. It's 1.22 HP per CI. Anything over 1.2 is gonna cost you- money and some reliability.
I had an all bore 107" that pulled 120 HP and 131 TQ from an undersized TB (50mm). My dyno tuner who tuned me a couple diff cams over the years said I could've pulled 130 HP (1.21 HP per CI) with an HPI 58mm but said there was no point. Especially on a touring build. My CCP was 205 which was enough as well for a touring build.
IMO...... aim for about 1.1 to 1.15 HP per CI (108-112) at most. Unless you just wanna hit 120.... which just costs money. And......reliability.
I had an all bore 107" that pulled 120 HP and 131 TQ from an undersized TB (50mm). My dyno tuner who tuned me a couple diff cams over the years said I could've pulled 130 HP (1.21 HP per CI) with an HPI 58mm but said there was no point. Especially on a touring build. My CCP was 205 which was enough as well for a touring build.
IMO...... aim for about 1.1 to 1.15 HP per CI (108-112) at most. Unless you just wanna hit 120.... which just costs money. And......reliability.
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