who in Brisbane would you recomend to do up a head to those specs?
and what head would be best to use?
-----Original Message-----
From: Brad HALLETT <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Tuesday, 8 August 2000 7:46
Subject: Re: 200hp L20 on tha cheap
>Andrew
>Bottom line is '200hp' and 'on tha cheap' don't easily go together. My
>advice is directly inline with Errols and is a proven formulae over the
>years:
>40 mm inlet ports with turning vanes behind valve
>44 mm inlet valves
>38mm exhaust ports with turning vanes behind valve
>36mm exhaust valves
>Polished exhaust port
>Ground inlet ports (not polished - air turbulance required so good rule is
>'cats tongue')
>Don't overbore the block too much to reduce high rev cylinder wall flex,
but
>use forged flat tops.
>Consider using high pin heights and long rods to assist rod:stroke ratio
for
>easier revs.
>Aim for 11 or 12:1 compression, i.e. match deck of block to piston heights
>and modify CR through combustion chamber manipulation.
>Use 45mm Webers and matchport manifold both ends
>Spend $$$ at reputable dyno shop. In Qld I would only use Greg Summerville
>at Jindalee.
>
>regards
>Brad
>
>----- Original Message -----
>From: "Errol Smith" <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Sent: Tuesday, August 08, 2000 7:13 AM
>Subject: Re: 200hp L20 on tha cheap
>
>
>> Andrew,
>> To make 200hp reliably, you will need the comp up around 11:1. To run
11:1
>> reliably you will need forgies. All the heads I have seen making around
>> 200hp on L series are using approx 40mm inlet ports with 44mm inlet
>valves.
>> Exhaust ports are taken out to the max with the humps completely removed
>> and a smooth radius on the upper port surface. Use 36mm exhaust valves.
>The
>> valves are usually one piece 214N S/Steel, stellite tipped, tuliped &
>swirl
>> polished.
>> Port profiles on the inlet side are the key to making the power. Not only
>> do you open the port sizes but shape the floor of the port into a D laid
>on
>> its flat. This gives the largest flow for the port size.
>> The next step would be to fit an injection system eg Wolf Motec etc. You
>> wont make much if any more at the top end, but it will make it smoother
>and
>> more grunty out of corners.
>> My two bobs worth anyway.
>> Cheers
>> Feral Errol
>> ----------
>> From: Andrew Kubenk <[EMAIL PROTECTED]>
>> To: [EMAIL PROTECTED]
>> Subject: 200hp L20 on tha cheap
>> Date: Monday, August 07, 2000 10:51
>>
>>
>> ive got a mate with a fairly tough L20 in a stanza and we were discussing
>> freshening
>> up the old donk.
>> so
>> i need a few suggestions on making about 200 flywheel hp fairly reliably.
>> we are starting with, 2x45 webers, datrally manifold, fairly ported head,
>> larger
>> valves, flat tops.
>> please advise as to how far the head (port, polish, valve size) and
>> block(pistons?
>> balancing etc) needs to go as well as possible upgrades to induction
>> without
>> too many electronic gizmos.
>> please advise and thanking in advance.
>> andrew
>>
>>
>>
>
>
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