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Old 12-03-2002, 01:59 AM   #916
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Ever had one of those flash back things....

I figured we had seen the end of this mighty thread...
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Old 12-03-2002, 07:50 PM   #917
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Old 12-03-2002, 08:04 PM   #918
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I should have guessed you were going to get technical. But when you machine out the web on the crank counterweight balance how do you know how much to take off at the other end to bring it all back into proportion.

If this makes any sense to you.
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Old 12-03-2002, 08:29 PM   #919
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Old 12-03-2002, 08:35 PM   #920
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Quote:
Originally posted by modellor
I should have guessed you were going to get technical. But when you machine out the web on the crank counterweight balance how do you know how much to take off at the other end to bring it all back into proportion.

If this makes any sense to you.
Yep, I think Dennis was reffering to dynamic balancing of the whole engine when in operation and you were reffering to the balancing of the crankshaft itself.

I'm no engine expert myself but I think the webbing that you refer to is directly opposite in direction to the intake window hole that affects the crank timing on the crankshaft. Maybe the same amount of metal can be taken out when you change the crank timing. That's an idea. But I think you need special machines small enough for rotary balancing of the crankshaft.
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Old 12-03-2002, 08:44 PM   #921
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Dennis, what are your views on Super Charging. Do you think it is hype or can the back flow of exhaust gases reentering the cylindder become effectively a super charger.
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Old 12-03-2002, 08:58 PM   #922
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I think the more correct term for that is "over charging" And yes it is a remarkably evedent power gain... You will both see and hear when you find the right pipe length.
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Old 12-03-2002, 09:04 PM   #923
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I know all about the exhaust length factor. Spent ages at the track cutting the manifold and adjusting to find the correct length. Just didn't think that putting burnt gases back into the equation would be really beneficial.

When you [email protected][email protected], you cant eat it and get nutrients from it because they were taken out the first time. That was were I was coming from.
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Old 12-03-2002, 09:08 PM   #924
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Old 12-03-2002, 09:10 PM   #925
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Old 12-03-2002, 09:15 PM   #926
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Yeah. I have seen that happen to few guys who didnt know what they are doing. My father was one of the first RCers in the UK and started the whole thing here in Ireland. He learnt how to mod engines from Sabbatini. At the 77 world championship for 1:8th
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Old 12-03-2002, 09:55 PM   #927
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Whats the theory behind polishing the sleeve and crank?
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Old 12-03-2002, 10:07 PM   #928
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It makes the flow a lot more efficient.
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Old 12-03-2002, 10:15 PM   #929
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Does it? I have a hard time believing that.A engine can only force so much air/fuel into the chamber given the design/ports in a .12.
Dennis?

Any motors on the market that could hang with a Smeltz?
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Old 12-03-2002, 10:23 PM   #930
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Here is part of an interview from Dennis. (RC Nitro Magazine)(On their website - Timing is everything)



The grinding and polishing are done in an effort to maximize efficiency and power output.

Last edited by modellor; 12-03-2002 at 10:27 PM.
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