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cant find flat tops 

 

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 Post subject: cant find flat tops
Posted: Mon Mar 14, 2005 5:00 pm 
Tyre Shredder
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i have an eb and i am trying to get parts and prices on parts for a new engine, however i am having trouble finding pistons. i am after flat tops, but i can only find semi flat tops, and they are to suit an ef/el, will these suit my car, and is it possible to get full flat tops at all?

also if i get flat tops will i have to different valves to stop them hitting?

 

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1993 EBII GLI, IT'S PERFORMANCE Stage 3 engine,
XH Snorkel, K+N panel, Pacie 4480, High flow cat,
2.5" Lukey cat back system. Monroe GT Gas shocks + struts.

just dyno'd at 140.9RWKW

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Posted: Mon Mar 14, 2005 9:52 pm 
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from what i know the directional pistons were made to benifit the flow of the inlet and exhaust gases, therefore increasing power? sooo...use em they should still work right...same engin minus that and the inlet pretty much, shouldnt cause problems unless its compression related.
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Posted: Tue Mar 15, 2005 6:01 pm 
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ndroo wrote:
from what i know the directional pistons were made to benifit the flow of the inlet and exhaust gases, therefore increasing power? sooo...use em they should still work right...same engin minus that and the inlet pretty much, shouldnt cause problems unless its compression related.


WTF? sorry mate but I dont quite understand :?

 

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Posted: Tue Mar 15, 2005 7:40 pm 
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Flat top pistons have 'notches' in the top for valve clearance.

If you're after flat top pistons, try emailing info@altedperformance.com

They sourced mine.

--Striker.

 

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Posted: Tue Mar 15, 2005 10:53 pm 
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Yeah but the indentations are there for valve clearance not for flow enhancement, thats what I dont quite understand???

 

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Posted: Tue Mar 15, 2005 11:13 pm 
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what ndroo was thinking about is the pistons that have a dome or crown on them shaped to aid the combustion process

 

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Posted: Wed Mar 16, 2005 1:01 am 
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ah k my bad 8-)

 

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Posted: Wed Mar 16, 2005 11:25 am 
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yer thats what i meant, sozzy i tend to confuse people :P

ndy
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Posted: Wed Mar 16, 2005 9:03 pm 
Tyre Shredder
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so for the simple minded what your saying is get the "semi flat tops"

 

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1993 EBII GLI, IT'S PERFORMANCE Stage 3 engine,
XH Snorkel, K+N panel, Pacie 4480, High flow cat,
2.5" Lukey cat back system. Monroe GT Gas shocks + struts.

just dyno'd at 140.9RWKW

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Posted: Wed Mar 16, 2005 9:31 pm 
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yup higher comp hypereutectic variants are your best option. forgies are overrated unless its a race motor and they are heavier so the higher rocipitating mass could reduce your spool up time and lower your safe redline if you only run a std crank and rods

 

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Posted: Wed Mar 16, 2005 10:30 pm 
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Jaysen wrote:
yup higher comp hypereutectic variants are your best option. forgies are overrated unless its a race motor and they are heavier so the higher rocipitating mass could reduce your spool up time and lower your safe redline if you only run a std crank and rods


"Forgies" are not heavier comparitively speaking, the forging process makes a denser pistons which can and is actually thinner than cast performance pistons in critical areas to offset any weight gain. Forged pistons cost more to manufacture compared to cast pistons, which is what hypereutectic pistons are. Virtually all cast pistons are now hypereutectic.

Hypereutectics are a better piston choice for a street engine running NO boost or NOS. The expand less than forged pistons and are cheaper.
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Posted: Fri Mar 18, 2005 12:07 am 
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exellent, just quickly, how much is a good price, the only one i havce got is $490 including ring kit etc.

 

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1993 EBII GLI, IT'S PERFORMANCE Stage 3 engine,
XH Snorkel, K+N panel, Pacie 4480, High flow cat,
2.5" Lukey cat back system. Monroe GT Gas shocks + struts.

just dyno'd at 140.9RWKW

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Posted: Fri Mar 18, 2005 7:05 pm 
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Why not just get the ACL RACE kit. I think its only $750 for the full rebuild kit. People have used this kit with boost up to 500rwhp.

Why do you want flat tops? If you want a comp increase, combine a EA head with a 4.0 bottom end.
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Posted: Fri Mar 18, 2005 7:46 pm 
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what comes in the ACL race kit and will it run alright with a stage 2 crow cam and standard computer?, also i thought ea's had the same bottom end as eb's (or is that just the block)?

 

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1993 EBII GLI, IT'S PERFORMANCE Stage 3 engine,
XH Snorkel, K+N panel, Pacie 4480, High flow cat,
2.5" Lukey cat back system. Monroe GT Gas shocks + struts.

just dyno'd at 140.9RWKW

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Posted: Fri Mar 18, 2005 9:14 pm 
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We fitted the acl kit to our XR6 ED...I must say it did increase compression if thats what you want...In this case forced induction is out of the question..I think the head has been machined before??...

 

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