One thing that works reasonable well in dyno tuning is to use a oxy/ac torch
tip cleaning kit to increase the size of the jets a tad at a time. I've done
this with quite good success. The tool is dirt cheap to buy and by using a
mic to check the size of each cleaner you have a close idea the increase and
you can use (or ruin) only a single jet for several runs.
My tool made by Murex has 12 cleaners ranging from .017",
020",.023",.026",.030",.034" etc. You can use number drill to get the same
use of a single jet. In the end I had a genuine Weber jet drill set but I
doubt you can find one these days.
----- Original Message -----
From: <fpspitfire@insightbb.com>
To: "Joe Curry" <spitlist@cox.net>
Cc: <fot@autox.team.net>
Sent: Friday, August 24, 2007 2:49 AM
Subject: Re: [Fot] Weber DGV Jet recommendations - 1500 spitfire
> I'm fully aware that this situation isn't great and I'm fully aware of the
> benefits of dual and single sidedraught carbs. While it's great to say
> just put a sidedraught weber on...I have to work within the rule structure
> of the SCCA Limited Prep engine rules..
>
> Currently that rule is:
> 1.5" Unmodified Stromberg or a 32/36DGV on an adaptor. What we are
> currently finding on the dyno is that the 32/36 is an improvement over the
> Stromberg, it just needs to be tuned more and I really don't want to buy
> 50 jets/air correctors to tune it.
>
> aaron
>
> ----- Original Message -----
> From: Joe Curry <spitlist@cox.net>
> Date: Thursday, August 23, 2007 23:48
> Subject: Re: [Fot] Weber DGV Jet recommendations - 1500 spitfire
> To: "'Mark J. Bradakis'" <mark@bradakis.com>, fot@autox.team.net
>
>> Let me add to mark's comment.
>>
>> Since the head design of the 8 port head is vastly different
>> from the design
>> of the Weber DCOE side draft, It is much more efficient to have
>> a dual Weber
>> DCOE setup so that the manifold runners will be more equal in length.
>>
>> With a single side draft, the outside two runners are longer
>> than the inside
>> two and it is therefore difficult to balance the cylinders with
>> a single
>> carb.
>>
>> Joe C.
>>
>> -----Original Message-----
>> From: fot-bounces+spitlist=cox.net@autox.team.net
>> [mailto:fot-bounces+spitlist=cox.net@autox.team.net] On Behalf
>> Of Mark J.
>> Bradakis
>> Sent: Thursday, August 23, 2007 9:03 PM
>> To: fot@autox.team.net
>> Subject: Re: [Fot] Weber DGV Jet recommendations - 1500 spitfire
>>
>> >I have a Weber DGV on my Spitfire 1500. ...
>> >
>> >Anyone have any suggestions?
>> >
>> >
>>
>> My suggestion is to toss that downdraft and its associated convoluted
>> manifold and put in a real sidedraft carb!
>>
>> Sorry, couldn't resist. I've been going through Spitfire
>> withdrawals,I really need to get one back on the road for the
>> upcoming fall season
>> here in the mountains of Utah.
>>
>> mjb.
>> spitlist@cox.net
>> Fot mailing list
>> Fot@autox.team.net
>> http://autox.team.net/mailman/listinfo/fot
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>
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