Date: Sun, 23 Mar 2003 19:59:11 -0600
Reply-To: John Rodgers <j_rodgers@CHARTER.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: John Rodgers <j_rodgers@CHARTER.NET>
Subject: Re: lifters for new engine? - and increased stroke
Content-Type: text/plain; charset=us-ascii; format=flowed
I always understood that the rule of thumb was (1) increase power by
increasing cylinder pressure by increasing the stroke, which would allow
you to turn lower RPM, thus saving on the engine.....produces lots of
torque. (2)On the other hand, increase power by increasing cylinder
bore to increase pressure and at the same time maintain
rpm..........lots of power, but torque range shifts. These two
approaches do give added power but would maintain the integrity of the
engine. In either case, increasing RPM adds even more power , but
raises the strain on the rotating assembly considerably and shortens the
life of the engine.
Am I wrong?
John Rodgers
88 GL Driver
Damon Campbell wrote:
>All i'm doing for now is increasing the bore and
>stroke... the engine will end up with a 2.3
>displacement. Turbo is way (way) down the road...
>assuming i can even get this put together correctly
>:-) None of this that i am doing is revolutionary, by
>any means. There are people doing crazy things with
>water boxers - far exceeding these minor mods.
>
>It looks like i am going to stick with hydraulic
>lifters, though. I am not going to be running higher
>RPM (my ultimate goal is to get enough oomph to run
>higher gear ratios/lower rpm comfortably).
>
>It seems as though the proponents of the mechanical
>lifters tend to be rooted in more of a racing school
>of thought. This is still a (somewhat) daily driver,
>so just "having it work" is appealing.
>
>Thanks for the input, all...
>
>actually, one other question: what is the best way to
>maintain the compression ratio when increasing the
>stroke? The current working solution seems to be
>machining down the tops of the pistons - which seems a
>little excessive. Any suggestions on this one?
>
>Again, thanks,
>-Damon
>
>
>--- Craig Oda <craigoda@COMMUNITYBUILDERS.INFO> wrote:
>
>
>>Stan, when went down to Damon's garage to check out
>>his engine, he
>>mentioned that he was increase the stroke of his
>>engine and I think
>>getting a hotter cam. I'm not sure what he's doing
>>about the valves,
>>but he did have a turbo charger on his shop table
>>which he indicated
>>that he was going to hack on, so I think he's going
>>to run it at higher
>>than normal RPM. Just FYI.
>>
>>-- Craig
>>
>>Stan Wilder wrote:
>>
>>
>>
>>>Unless you're going to run big valve heads and want
>>>
>>>
>>to run your engine at
>>
>>
>>>higher than normal rpms, I'd stick with stock.
>>>
>>>
>
>
>=====
>'84 Westy (Sparky)
>'65 Kharma Ghia (Dharma)
>
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