Milling cylinders
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From: Loveland Colorado
I wondered If changing piston pin location was an option! Where would be a good source??
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From: Loveland Colorado
Assuming your S&S cylinders are 4.125 bore, you will still have to bore cases for the larger dia spigots to fit. If you want to go that route cut cylinders to 4.912 and use pistons with 1.083 comp height instead of the S&S pistons which are 1.050
Whole lot easier to keep 107, go with domed pistons. At 15k cylinders might clean up with light hone. Your machine shop will have to figure that out. Worst case you have to get new cylinders for 107
Save the 660ps2 for better heads with proper headwork
Whole lot easier to keep 107, go with domed pistons. At 15k cylinders might clean up with light hone. Your machine shop will have to figure that out. Worst case you have to get new cylinders for 107
Save the 660ps2 for better heads with proper headwork
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From: poway
A really good person to talk to about this is WFOlarry. You can get the heads done by Larry.
Besides sinking the valves, it's possible that Gasser CNCs the chamber?
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From: Loveland Colorado
Only SnS uses the 1.050 piston CH.. I believe Wiseco, Keith Black (1.076), CP (carrillo), Screaming eagle and Mahl make 4 1/8 pistons with a somewhere between a 1.082 to 1.090 piston CH. Makes the piston CH the same as standard 4 3/8 stroke TC motor.
A really good person to talk to about this is WFOlarry. You can get the heads done by Larry.
Besides sinking the valves, it's possible that Gasser CNCs the chamber?
A really good person to talk to about this is WFOlarry. You can get the heads done by Larry.
Besides sinking the valves, it's possible that Gasser CNCs the chamber?
I could see that Wolf hand worked the chambers and ports. They may flow fine with a bigger bore, I just don’t know enough about flow to be confident, but I think that bc he designed the flow for a 107 I probably don’t need to expect them to perform well on a 124. Or does the flow/velocity pick up with a bigger bore? I would take them back to him this Winter, But he’s 1000 miles away now. I was just bringing the compression up and putting a larger cam like Wolf told me I should do from the start, now I’m all over the place!!
**also, I remember that he used a bigger intake valve
Last edited by Lostdad; Sep 12, 2022 at 09:58 AM.
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From: Central Ohio
I have no input on which direction you should go, but I'd price new cylinders before you commit to trimming one down. Having a shop shave a little off isn't a big deal, but that much material you'll potentially be cutting the sleeve to make clearance for the crank
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From: san antonio
I am staying out of this one; lots of information for the OP to sort through; can't add anything. However, if the Gasser heads for a 107" motor flowed 250cfm @28", I would not be sending heads back to Gasser for re-work. Those heads should have flowed 275-300 from the jump IMHO. As has been said, WFO Larry, AKA, Larry's Motorcycle and Machine would be a good source to sort through the various options and make a decision.
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From: Loveland Colorado
I am staying out of this one; lots of information for the OP to sort through; can't add anything. However, if the Gasser heads for a 107" motor flowed 250cfm @28", I would not be sending heads back to Gasser for re-work. Those heads should have flowed 275-300 from the jump IMHO. As has been said, WFO Larry, AKA, Larry's Motorcycle and Machine would be a good source to sort through the various options and make a decision.
I’ll talk to Larry soon
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From: poway
Don Dorfman was thinking about sleeving stock cylinders and making a kit. That IMO, is too much work.
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From: Granville New York
Don't compromise the outcome of your build because you have a part or two you want to make work...follow Max's advice and talk to Larry or Scott at hillside. A 107 with the right parts can be a great motor.
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From: poway
That is what is confusing to me about flow, I read, “don’t get wrapped up in cfm numbers, it’s about velocity.” At the same time I hear a head should flow xxx cfm. The 107 made 120 Ft lbs with a little Andrews 57 cam, but fell off from there to I think 100 hp. He said the head pipe was too small. I put the road rage 2 on and did a pull at Sturgis this year, made 100 hp 108 torque. They said my head pipe too big now. Another reason I was considering adding some cubes this winter.
I’ll talk to Larry soon
I’ll talk to Larry soon
While I like smaller intake ports on a 95/98, once you hit 107, it is probably best to use 1.8 inch ports.