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Author Topic: Head Shaving  (Read 5492 times)

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Offline Johnson Mowersports

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Head Shaving
« on: January 05, 2014, 06:13:10 pm »
What's a reasonable amount to shave the head on a ohv single without having to change pushrod length?
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Josh

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Offline Darkviper

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Re: Head Shaving
« Reply #1 on: January 05, 2014, 06:21:43 pm »
I went 50 thousands still broke crankshaft in half anymore then that u risk blowing the head or snapping the crank on brigs snigle that's with stock push rods
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Offline cycloneracer

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Re: Head Shaving
« Reply #2 on: January 05, 2014, 06:39:12 pm »
If you are running the stock rockers you can "make" the stock pushrods work with about as much as you want to shave the head.

It isn't 100% right, but it will work.

But you can't run double springs with the stock rockers.

If your running roller rockers, spend the money for the correct push rods.

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Paul Krueger

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Offline Darkviper

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Re: Head Shaving
« Reply #3 on: January 05, 2014, 07:25:04 pm »
I ran double springs no problem it was crank that snapped after being in 3 race engines and compression it had caused it
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Offline cycloneracer

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Re: Head Shaving
« Reply #4 on: January 05, 2014, 07:44:06 pm »
Quote from: Darkviper on January 05, 2014, 07:25:04 pm
I ran double springs no problem it was crank that snapped after being in 3 race engines and compression it had caused it

Crank Breaking has nothing to do with valve springs, rocker arms, or push rods.

Compression didn't break it either.    RPM's, too much timing and crank flex is what causes the crank to break.


I ran my FX engine with the weak OHV crank for 4 years without breakage.   Spun it 6800 all the time.  Had .125 off the head.  Double springs with roller rockers.   BUT I supported the crank and set my timing with a timing light.
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Paul Krueger

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Offline Johnson Mowersports

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Re: Head Shaving
« Reply #5 on: January 06, 2014, 12:38:21 am »
So .060 would be reasonable with a stock cam and shimmed springs. Would just give it a little more bite?
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Josh

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Offline cycloneracer

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Re: Head Shaving
« Reply #6 on: January 06, 2014, 12:41:50 am »
Yep.   As long as your going to run stock rockers.    It is going to throw you geometry out of whack.  But I know there are several out running that way. 

Be sure to run steel push rods on both valves.   Stock there is 1 steel and 1 aluminum.
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Paul Krueger

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Offline Johnson Mowersports

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Re: Head Shaving
« Reply #7 on: January 06, 2014, 07:06:38 am »
Yeah got that already did the steel pushrods and billet retainers. Thanks for the input guys
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Josh

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Offline RFMotorsports

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Re: Head Shaving
« Reply #8 on: January 11, 2014, 10:28:13 am »
Is there a "safe" amount to take off the head? Just want to true mine up.
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Offline Johnson Mowersports

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Re: Head Shaving
« Reply #9 on: January 11, 2014, 05:14:27 pm »
Don't think this is gonna work for me I cut the head and with the cam the geometry is off way to much
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Josh

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Offline leman

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Re: Head Shaving
« Reply #10 on: January 11, 2014, 08:50:33 pm »
Quote from: Johnson Mowersports on January 11, 2014, 05:14:27 pm
Don't think this is gonna work for me I cut the head and with the cam the geometry is off way to much

Wouldn't making different length push rods fix the geometry?
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Offline Johnson Mowersports

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Re: Head Shaving
« Reply #11 on: January 11, 2014, 08:58:09 pm »
Yeah was just trying to make the steel factory ones work
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Josh

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