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Out of all my new found knowledge I've learned what I think I will do when I do my next build. I would like to build a reliable 120/120 motor that runs on pump gas. I think I'd send the bottom end to Darkhorse to blueprint it and clean up the stock assembly, have the Timken bearing upgrade done and have the stock crank trued, welded and balanced. Once I got that back I'd install the 1 1/8 cylinders and pistons. What would be a good cam and compression ratio to run with this setup? What am I missing? I think it makes the best of what I've got without going overboard.
 

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Don't want to go to big with the 1-1/8 pistons. Might be more than you can handle. You should probably stick to paper builds and leave the real builds to the professionals.
 

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Out of all my new found knowledge I've learned what I think I will do when I do my next build. I would like to build a reliable 120/120 motor that runs on pump gas. I think I'd send the bottom end to Darkhorse to blueprint it and clean up the stock assembly, have the Timken bearing upgrade done and have the stock crank trued, welded and balanced. Once I got that back I'd install the 1 1/8 cylinders and pistons. What would be a good cam and compression ratio to run with this setup? What am I missing? I think it makes the best of what I've got without going overboard.
You might be able to get the S&S crank for about what the cost of correcting your crank. Then you would have a great crank.
 

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Don't want to go to big with the 1-1/8 pistons. Might be more than you can handle. You should probably stick to paper builds and leave the real builds to the professionals.
Dayum! Tough crowd.LOL
 

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You might be able to get the S&S crank for about what the cost of correcting your crank. Then you would have a great crank.
Out of all my new found knowledge I've learned what I think I will do when I do my next build. I would like to build a reliable 120/120 motor that runs on pump gas. I think I'd send the bottom end to Darkhorse to blueprint it and clean up the stock assembly, have the Timken bearing upgrade done and have the stock crank trued, welded and balanced. Once I got that back I'd install the 1 1/8 cylinders and pistons. What would be a good cam and compression ratio to run with this setup? What am I missing? I think it makes the best of what I've got without going overboard.

120/120 is within reach with keeping reliability. You should talk to whoever is going to be doing your heads for their recommendation for which cams and what compression to run. I would also consider an S&S crank vs having the stock one reworked.
 

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120/120 from a 117" engine is not a large expectation.
Those will easily show 130/135 ft/lbs, and hp usually hovering at/near 130/135 also.
Wood cams dyno library has one example we built years ago that went 141/144........totally streetable, pump gas friendly.
Another I will make mention we built from San Jose, CA, tuned at RC Cycles in Hayward, CA........117"/10.0cr/our Stage IV Heads/Supertrapp/55mm HPI.....heres the cam.....a little Wood TW-6G that he was running in his 88"...........125/136, 120 ft/lbs from 2300-5300!!
Surpised us as well.:)
Finishing 3, 117" engines currently.
Scott
 

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Discussion Starter #7
Don't want to go to big with the 1-1/8 pistons. Might be more than you can handle. You should probably stick to paper builds and leave the real builds to the professionals.
You go ahead and do that sparky. They need your business.
 

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Discussion Starter #8
120/120 from a 117" engine is not a large expectation.
Those will easily show 130/135 ft/lbs, and hp usually hovering at/near 130/135 also.
Wood cams dyno library has one example we built years ago that went 141/144........totally streetable, pump gas friendly.
Another I will make mention we built from San Jose, CA, tuned at RC Cycles in Hayward, CA........117"/10.0cr/our Stage IV Heads/Supertrapp/55mm HPI.....heres the cam.....a little Wood TW-6G that he was running in his 88"...........125/136, 120 ft/lbs from 2300-5300!!
Surpised us as well.:)
Finishing 3, 117" engines currently.
Scott
Thanks Scott. I was thinking of a build that can run on low octane gas too.
 

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I think you missed the whole point of my sarcasm. Here is a hint, look up 1-1/8 pistons.
 
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