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Author Topic:   switching gears from small engine to big engine????
JT54
Dirt Maniac

Total posts: 170
posted March 30, 2005 10:04 AM  
I normaly run a strong 355 with good parts on 1/4 mile high banked track with 620 gears turning 7200 .....I have a new engine 406 good parts would like to stay in the same rpm range or a little lower....cam should pull good from 3500 to 7200 ....someone please help me make a good decision on gears.....dont be shy please tell me your experience with this situation ....thanks...JT54

dirtmod0
Dirt Maniac

Total posts: 143
posted March 30, 2005 10:21 AM  
stick with what ya got maybe one or two points higher, 6.00 5.83

NJantz
Dirt Forum Champ
Total posts: 755
posted March 30, 2005 11:47 AM  
In the past when I switched from a 355 to a 377, I ran the same gear on the same 1/4mile track.

andykmod
Dirt Freak

Total posts: 351
posted March 30, 2005 12:55 PM  
I would try a 6.00 myself

JT54
Dirt Maniac

Total posts: 170
posted March 30, 2005 12:56 PM  
any more 406 users out there have some input on this?.....I apreciate all your coments...thanks JT54

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted March 30, 2005 01:03 PM  
You could prob go to 5.83, just because of the extra torque of the bigger engine. Thats if you are able to use more of the available torque. If you cant use it then you wont make a difference because you wont be able to hook it up and pull through the rpms anyway without spinning which gets you nowhere. In that case you'd be better off staying with what youve got.

[This message has been edited by dirtbuster (edited March 30, 2005).]

terrellracing
Dirt Full Roller

Total posts: 69
posted March 30, 2005 07:31 PM  
i run a 5.67 gear in my 412. turn about 6700 on 1/4.

JT54
Dirt Maniac

Total posts: 170
posted March 30, 2005 09:03 PM  
I have a 5.43 and a 6.00 I will probably try the 6.00......the problem I am having is the folks that have the gear thing figured out localy will only get you about 20 points up or down from where they are running .....like most racers I have one chance to guesse what the proper gear is as far as buying a new set....and then I am stuck with what I got......I hope the 6.00 doesnt spin it to tight....thanks for the advice ...JT54

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