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Old 06-06-2015, 09:16 PM
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Hey guys, at the moment my Nova Keep Off 7 has 2 silver ( I think each is .2mm) head shims, so a total of .4mm head shim thickness. Can I remove one to test for power and performance changes? - Thank you!
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Old 06-07-2015, 12:04 AM
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Originally Posted by sn47som1 View Post
Hey guys, at the moment my Nova Keep Off 7 has 2 silver ( I think each is .2mm) head shims, so a total of .4mm head shim thickness. Can I remove one to test for power and performance changes? - Thank you!
Not sure bout d keep off but depends on the % of nitro u using, if nova c6 shouldn't be a problem.

Some taiwanese motor love higher compression ratio, not sure bout nova
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Old 06-07-2015, 03:23 AM
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Originally Posted by sn47som1 View Post
Hey guys, at the moment my Nova Keep Off 7 has 2 silver ( I think each is .2mm) head shims, so a total of .4mm head shim thickness. Can I remove one to test for power and performance changes? - Thank you!
I dont know about the Keep off engines, but Nova's typically come with .8mm shimming and after a few gallons you can remove a .2mm and add a .1mm to get to .7mm. Chances are you are missing something, or the brass shim is stuck to the head button.
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Old 06-07-2015, 12:31 PM
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Originally Posted by kgombe View Post
Actually they say its shimmed for 25%, maybe they can't use no higher than 25% across the pond?

just checked a manual here and the recommended fuel is 25%
Originally Posted by beidle99 View Post
I dont know about the Keep off engines, but Nova's typically come with .8mm shimming and after a few gallons you can remove a .2mm and add a .1mm to get to .7mm. Chances are you are missing something, or the brass shim is stuck to the head button.
My understanding was the .8 shimming is good for 30%, and .7 is just right for 25%.

Hence why I thought they came shimmed for 30. IF they now come shimmed for 25 (.7) then that would be different.
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Old 06-07-2015, 01:18 PM
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I have a brand new keep off 4 crank shaft that I sent to Lance at RcRenew to be silicone filled. Never used, never installed. Pm me if interested
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Old 06-07-2015, 05:04 PM
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Originally Posted by beidle99 View Post
I dont know about the Keep off engines, but Nova's typically come with .8mm shimming and after a few gallons you can remove a .2mm and add a .1mm to get to .7mm. Chances are you are missing something, or the brass shim is stuck to the head button.
Thats the thing, there is no brass shim. ONLY 2 silvers. I would like to remove one. Wats the worst that could happen? pre detonation? It actually sounds like then Im already running a high compression ratio with .4mm which is what I was thinking, but Id like to raise it more....
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Old 06-07-2015, 05:14 PM
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Actually to be honest Im just assuming they are .2 because I thought all silvers were .2 but maybe they are thicker like .3 or .4mm shims each making a total of .6 or .8mm.... I cant measure them at the moment
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Old 06-07-2015, 06:17 PM
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the silver shims are .3
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Old 06-07-2015, 06:18 PM
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The copper shim may be sandwiched between the 2 .30 shims.

The stock setup is 2 .30 silver shims and one .20 copper or brass shim for a total of .80.
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Old 06-07-2015, 07:24 PM
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Thanks so much guys! Cool, so now I know I'm running a .6mm stack. Have any of you run .3mm?
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Old 06-07-2015, 07:29 PM
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i have a plus 4 that has just about had it. i love the engine, but its time to move on. whats the closest engine to it currently? i love the fact of how smooth it is in my buggy and would like to get the same from my next mill.
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Old 06-07-2015, 08:39 PM
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Originally Posted by pballer2777 View Post
i have a plus 4 that has just about had it. i love the engine, but its time to move on. whats the closest engine to it currently? i love the fact of how smooth it is in my buggy and would like to get the same from my next mill.
plus 21-4btts?

lmk if you are looking for one

new engines are drnt bore x stroke , the mito4
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Old 06-07-2015, 08:41 PM
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Originally Posted by sn47som1 View Post
Thats the thing, there is no brass shim. ONLY 2 silvers. I would like to remove one. Wats the worst that could happen? pre detonation? It actually sounds like then Im already running a high compression ratio with .4mm which is what I was thinking, but Id like to raise it more....
piston will hit the squish band on head button , engine will be toast
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Old 06-08-2015, 02:50 PM
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Thanks Monty! looks like ill be leaving it alone lol
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Old 06-08-2015, 02:56 PM
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Originally Posted by pballer2777 View Post
i have a plus 4 that has just about had it. i love the engine, but its time to move on. whats the closest engine to it currently? i love the fact of how smooth it is in my buggy and would like to get the same from my next mill.
I saw a Mito 4 run a few weeks ago. It was so linear and smooth all the way from bottom to top. Im sure you wouldn't be disappointed at all. The guy running it claimed he was getting over 11 and 1/2 mins run time too :0 Could have been a crazy small venturi he was running.... idk
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