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How far can you take head work 

 

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 Post subject: How far can you take head work
Posted: Thu Jul 27, 2006 4:38 pm 
Getting Side Ways
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Hi everyone

Just wondering what I can do to the head in my EL without having to modify anything else, like pistons.
Wouldnt mind porting and polishing it up at least.
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Posted: Thu Jul 27, 2006 4:40 pm 
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Can put too large a cam in or will upset factory ECU. I don't see any reason for limits to the extent of port and polishing.

 

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Posted: Thu Jul 27, 2006 4:43 pm 
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Only restriction is the thickness of the walls-in other words the amount of material between chambers and ports,and the water jacket.Take it to a reputable shop.

 

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Posted: Thu Jul 27, 2006 4:43 pm 
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I've got an RPD RSpec3, does that change anything?
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Posted: Thu Jul 27, 2006 4:51 pm 
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twr7cx wrote:
Can put too large a cam in or will upset factory ECU. I don't see any reason for limits to the extent of port and polishing.


except that porting too much will lower intake velocity, which will lower your torque, especially if your sticking to a cam small enough to work with the factory ecu

Cory
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Posted: Thu Jul 27, 2006 5:43 pm 
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port, polish and shave the head... youve got the RPD cam now... have you changed your valve springs?? get a valve grind.. better cam sprocket
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Posted: Thu Jul 27, 2006 6:22 pm 
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Can I port polish and shave the head without changing anything else.. I mean can I remove the head.. get all that done.. and then bolt it back on no worries?

Yeah I've changed my valve springs.
What's the benefit of a better cam sprocket?
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Posted: Thu Jul 27, 2006 6:28 pm 
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take all the rocker gear and cam out and take your head into a reputable machine shop and get them to port polish and shave it... they'll remove the valves and springs and put them back in when they're done
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Posted: Thu Jul 27, 2006 6:32 pm 
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I think I'm being misunderstood. By doing this headwork.. will I have to change anything else like pistons or rods for example?
I understand what everything in the engine is.... but I'm by no means knowledgable about any of this stuff hehehe
Also yes I will be removing the head myself and putting it back in.. I'll be the one asking to borrow someone's torque wrench later :P
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Posted: Thu Jul 27, 2006 6:34 pm 
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ha ha i see now.... nah you'll be fine to keep your stock pistons and rods and do heaps of headwork...
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Posted: Thu Jul 27, 2006 6:39 pm 
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Awesome hahaha
I'm not good at getting my point across... here's what my plan is
*Remove head (leave valve springs attached to head)
*Have head ported, polished and shaved
*Refit head
*Probably get RPD rocker gear and venier cam and fit those while I'm there

Couple more questions from the headwork newb.. what benefits does changing the cam sprocket have? and what's a valve grind?
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Posted: Thu Jul 27, 2006 6:47 pm 
Getting Side Ways
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valve grinding cleans up the tops of the valves where a lot of black "crap" can build up..

not too sure bout the sprocket... (vernier gear)
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Posted: Thu Jul 27, 2006 6:49 pm 
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This engine has no crap anywhere.. last time we had everything opened up she was clean and sparkly as :)

Thanks for the help mate
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Posted: Thu Jul 27, 2006 6:55 pm 
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thats alright... spose mines on gas which could explain thet s**t buildup
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