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How much can you shave a 2.4 head?


 
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1stGener
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PostPosted: Tue Mar 06, 2007 6:11 pm    Post subject: How much can you shave a 2.4 head? Reply with quote

My nephew is building a 2.4 that is mostly stock bottom end, brand new and fresh but still basically stock. He was interested in shaving his head to bump the compression up and putting some crane 16s or 18s in it...How much could he mill it and be safe? How much would it bump his compression up too? What cam would you run in it? He is going to have all bolt on's..including long header and modified intake...he is having the head ported too...thanks guys
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DOHCRT
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PostPosted: Wed Mar 07, 2007 6:37 pm    Post subject: Reply with quote

I would not recommend shaving the head just to gain compression. This should only be done if the heads surface is warped, and only the minimum amount should be shaved. This goes for all OHC engines. What people don't take into account is that when you mill the head, you are changing the distance between the cam and the crank. This affects valve timing. Even with the timing belt installed perfectly, the change in distance will cause the valve timing to be slightly retarded. If you still want to shave the head, it would be wise to invest in a set of cam gears to give you the ability to advance camshaft timing to compensate for the difference.

Personally, I would invest money on pistons that would yield a higher compression.
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1fast2liter
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PostPosted: Wed Mar 07, 2007 7:47 pm    Post subject: Reply with quote

x2
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chipdogg
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PostPosted: Wed Mar 14, 2007 8:39 am    Post subject: Reply with quote

There's nothing wrong with shaving a head for compression, lots of guys do it to gain some cheap power. I know plenty of people that have shaved heads for only this purpose. Head shaving + cam gears would be hella cheaper than buying pistons and rods. Plus you can still tune cam gears for more power. That's the route I'm going first...
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PostPosted: Thu Mar 15, 2007 8:42 pm    Post subject: Reply with quote

yea chips right.. lots of people have milled heads..

my setup is 0.30 milled head, 3angle valve job, crane 18s, pt valvetrain
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chipdogg
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PostPosted: Thu Mar 15, 2007 8:51 pm    Post subject: Reply with quote

I think you mean .030" Derrick Wink
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DOHCRT
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PostPosted: Sat Mar 17, 2007 12:10 pm    Post subject: Reply with quote

I'm not saying you cant mill the head. The head can be milled to the maximum amount allowable by the manufacturer. There is a lot of engineering that goes into these designs and specifications. If you think you know more than the engineers who designed the head, then by all means do what you want. Other things besides maximum horsepower need to be considered when modifying an engine. Sure, you may gain some power, but what else have you affected? Just because other people do it, doesn't mean its good. I could go on about combustion efficiency and other things, but obviously nobody cares.

Bottom line is that you can mill the head as long as you keep it within tolerances and make other modifications to fine tune the valvetrain.
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javier rt
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PostPosted: Wed Jul 07, 2010 9:34 am    Post subject: Reply with quote

actually my car has 12:5 pistons with a the head decked out .40mlm never had a problem my friend had his head decked 80mlm and never had a problem. although timing is very important.
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JeffB#2
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PostPosted: Wed Jul 07, 2010 3:54 pm    Post subject: Reply with quote

What you shouldn't do is mill a warped OHC head to make it flat again. When you bolt it back onto a block, the cam journals are no longer aligned unless you had the journals line honed AFTER shaving it.

Take a known warped head sitting on a bench and bolt a cam into it. Chances are that the cam will not turn. Now shave that head, bolt it down to a block and see if the cam turns. I betcha it won't. Ask your machinist.
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neon=ferrari
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PostPosted: Mon Jan 16, 2012 12:43 pm    Post subject: Reply with quote

yup don't shave the head with out cam gears and bigger idler because it will change the timing and loosen the belt. when my race cars head was shaved 30" and the block was shaved 60" the belt loosened up and slipped on the first start and oops we need to build another motor.
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Ianguilly
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PostPosted: Mon Jan 16, 2012 6:48 pm    Post subject: Reply with quote

Ummm dead thread bump....
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robert 'bob' paulson
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PostPosted: Mon Jan 16, 2012 7:46 pm    Post subject: Reply with quote

Ianguilly wrote:
Ummm dead thread bump....

maybe he figured because it was already bumped once with a three year span that the year and a half span he bumped it from was nothing.
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PostPosted: Tue Jan 17, 2012 8:20 pm    Post subject: Reply with quote

still funny to watch. oh wait, china spam time....
that very helpful, keep up.
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PostPosted: Mon Nov 27, 2017 3:14 am    Post subject: yueqin Reply with quote

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