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Author Topic:   Engine RPM
dennie
Dirt Roller

Total posts: 17
posted February 23, 2005 11:51 AM  
Built a new engine for our modified the engine builder is saying that with the small tires we may have to ride the brakes,He thinks that the engine will shut down so fast it will lock up the rear wheels.
Has anyone ever heard this before?

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted February 23, 2005 12:49 PM  
Never heard that one before.. actually I dont see how riding the brakes woudl even help.

zeroracing
Dirt Forum Champ
Total posts: 1876
posted February 23, 2005 12:51 PM  
i have seen guys lock up a motor from jumping out of the gas and on the brakes HARD it is very hard to do, and rare.

Istock66
unregistered Total posts: 1876
posted February 23, 2005 04:30 PM           send a private message to zeroracing   Edit/Delete Message   Reply w/QuoteBBBBBB
you must have lw parts, whats the bobweight??

Ive been down to 1590 in bobweight and with that motor I let of slowly, rather than all at once fast..

no biggie youll get used to it

Racer111
Dirt Freak

Total posts: 259
posted February 23, 2005 05:59 PM  
Find a new engine builder before its to late.

leapinlizard
Dirt Freak

Total posts: 402
posted February 24, 2005 08:04 AM  
While decelleration forces can prove more than the rear contact patches can compenstate for, locking up a motor won't happen. Although the rear tires will slip while decellerating in gear. It's called engine braking. With enough compression and lightweight rotational mass it's possible not to need the brakes on entry at all. You can assimulate the action by down shifting in loose gravel or snow. Down shift far enough and weight will transfer off the rear tires causing a chirp or scratch as someone might say.

iowatoolman
Dirt Freak

Total posts: 369
posted February 25, 2005 11:39 AM  
if doing so make sure that you have a good set of gears and set up correctly as such forces can ruin a set of gears

drive hard or drive home

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