Re: 1.5" vs 1.75" SU's
Date: Thu, 4 May 2000 09:54:18 -0400 (EDT)
From: Martin Walter <martin@qnx.com>
Subject: Re: 1.5" vs 1.75" SU's
Previously, you (Kyle Hagemann) wrote:
| -----Original Message-----
| From: Martin Walter
| >Those of you who are running 1.75" SU's, what manifold are you
| >using? I am currently using 1.5" SU's on my Mini-Stock racer,
| >but am having problems getting enough fuel for the LZ22 to run
| >reliably at 7000rpm without melting pistons.... remember last
| >season? I don't want to repeat that this year. What's the
| >best doner to get carbs off? What's the best manifolf to use?
| >Can I use the 1.5" manifold and just open it up to 1.75"?
|
|
| Hi Martin, bb's:
|
| Egad, man, don't start talking inches! :-) Assuming that 1.5"
| is 38mm, and 1.75" is 46mm, NOW I know what ya mean!
This dates back to my Mini Cooper S days when I lived in England, twin
1.25" SU were stock on these... Funny thing was I always worked in metric,
just can't get used to referring to SU's any other way!
|
| >From list traffic, I've gathered that 2L is about as big as you
| want to run on 38's. 2L and up, especially higher RPM engines,
| like the 46's. You can probably port the manifold to agree to
| the larger carbs; some recommend modifying the insulator to match
| the carb on one side and the manifold on the other. Your call!
| For a 7000RPM race engine, boring the manifold would probably be
| better.... but that's a guess on my part.
Yep, a couple of other list members have suggested just modding the insulator.
My concern with modding the manifold is if I have to go back the the 1.5"...
ahem... 38mm SU's due to tehc inspections or any such thing.
|
| The 46's are very easy to come by, at least around here.... the
| 240Z's had just the carb on 'em. You might have some issues with
| the linkage and whatnot, and maybe throttle plate rotation (but I
| think that's 2000 Roadster carbs). Julian's page might have
| info? I think the DQ classifieds lists a few sets for sale...
Do the throttle plates rotate in the opposite direction? That would be a
pain. Although a good excuse to convert to a cable I guess.
|
| Someone said he had a custom built set of 46's for sale, with
| ported manifold, linkage, da woiks.... if he doesn't address you
| directly, let me know and I'll give you his info.
He contacted me, but they are a little out of my price range.
|
| >Someone I know has a nissan 4x4 truck they are wrecking, I
| >believe the front diff is the same, can someone confirm?
| >Straight replecament? What ratio would it be?
|
| An ancient email I keep around says that the 1/83-6/83 720 4x4
| had a 3.90 R180; the 6/83-12/85 720 4x4 had a 4.11 R180.
I hope it's the 4.11 coz that's what I need.
Thanks for the help.
-Martin.
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