Date: Tue, 15 Sep 2009 23:14:48 -0700
Reply-To: John Anderson <wvukidsdoc@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: John Anderson <wvukidsdoc@YAHOO.COM>
Subject: Re: 2.1 heads
In-Reply-To: <021501ca3684$61c95d50$6401a8c0@PROSPERITY>
Content-Type: text/plain; charset=iso-8859-1
If their 2.4 uses stock diameter jugs (or close to it) you could use solid copper T4 head gaskets, available from several sources in 0.040, 0.060 last I checked (some time ago admittedly.) You can run a 0.040 without messing up the compression of the rubber head gasket, probably a 0.060 but.... Make sure they are annealed (should not "ring") if he tries that route. This is certainly better than doubling up steel ones (which I bet he don't have anyway.) There is essentially no pocket in 2.1 heads (10-15ml) and not much to add there. Off the top of my head I don't recall but don't 1.9 heads have a bit bigger pocket (10 years since I had a set in my hands, though there is a set out in the garage on an engine), might be an avenue to look at, but probably only 5-10ml at most, and hard to find. If considering the spacer it runs the risk of messing up the quench distance so the slight benefit from lowering static compression may F things up more
than not messing with anything in the first place as that distance needs to stay 0.040-0.060" on most engines. Best way would be bigger pocket in the piston of course (turning down a 2.1 piston doesn't gain you much because not much volume on the periphery up at the top with that big pocket, and it gets you right back into losing your quench area.) Does raise the questions, was this engine from the day when they were using AA Performance P&Cs or is it their own "proprietary" KB/silvolite or JE or whatever they claim they are using now. If from the AA days, some had ludicrous CR, and he should call em on it (like post bad mean reviews all over samba and everywhere else if they won't rectify) they've replaced many sets 2-3 times for people who bought ludicrously overpriced $75k vans (says so in lots of their adds) so should do the same for somebody suckered into an overpriced engine. Regular stuff to look at as well of course, how is he fueling
this beast, is it running lean, is he using good premium gas, were all the injectors new, and ideally flow matched, is the timing OK.
John
--- On Wed, 9/16/09, Scott Daniel - Turbovans <scottdaniel@TURBOVANS.COM> wrote:
Can't say there is, there's not much to take away between valve pockets or
anything like that. .
It's use thicker rings at the top of the piston barrels. ( or double rings,
but that seems shaky )
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
|