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Re: [Fot] GT6 Burnt plugs

To: Kas Kastner <kaskastner@gmail.com>, Bud R <levilevi@comcast.net>
Subject: Re: [Fot] GT6 Burnt plugs
From: <rkramer3@austin.rr.com>
Date: Fri, 16 Oct 2015 17:17:04 +0000
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Cc: "fot@autox.team.net" <fot@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: fot@autox.team.net
Sensitivity: Normal Fri, 16 Oct 2015 17:17:04 +0000
Can't you use the adjustable jets from the ZS carbs on a TR4?

Bob Kramer
rkramer3@austin.rr.com

---- Bud R <levilevi@comcast.net> wrote: 
> â??but what about the main jets."
> 
> 
> 
> ZS jets actually are adjustable, just not easily. The depth (from the bridge 
> to the top of the jet) of the jets on my 175 ZS carbs can range from 0.085 to 
> 0.187 inches. I have mine set at 0.125â?? deep. Donâ??t know if 150â??s are 
> the same but I suspect itâ??s close to the same.
> 
> To adjust take a 3/8 inch bolt and grind it flat on the bottom. Put two nuts 
> on to lock your â??depth setterâ?? bolt and then tap the jet down to a 
> measured depth (with your dial indicator). To move it up tap from the bottom 
> with a Honda valve guide (or similar protection) to protect the jet. Iâ??ve 
> set the jets with the carbs still on the carb.
> 
> 0.085 is lean and 0.187 is rich so adjust accordingly. Be precise this is not 
> a big range but it can make a difference.
> 
> 
> Bud Rolofson
> 
> Extreme Parts Racing (more than just a haircut)
> 
> 71TR6 CC57365 (Good 6)
> 71 Spitfire MK IV Race Car #3
> 69 Spitfire MK III (back up FE engine/dinghy car)
> 93 Minnie Winnie Race Support Vehicle 
> 77 Z-50A Hardly Davidson Honda Mini-Trail Bike (Triumph Pit Bike)
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> On Oct 15, 2015, at 2:12 PM, Kas Kastner <kaskastner@gmail.com> wrote:
> 
> > Did you check the plugs after the overheating so that you know it was from 
> > fuel problems not the overheating??
> > 
> > What needles are you running? How far open is the adjusting nut for the 
> > mixture?
> > 
> > Never be beaten by equipment.
> > 
> > 
> > On Thu, Oct 15, 2015 at 6:42 AM, <damys@charter.net> wrote:
> > Finally got the GT6 back together and had it at Brainerd for two track 
> > days.  First day still had overheating issues even with the oil cooler, 
> > external octopus oiling and scirocco rad.  Also had a vibration in the 
> > rear. 
> > 
> > Then we fabricated a full rad shroud and re-did one of the 240Z rear axles. 
> >  Lost all but a very minor vibration that show up at around 100 MPH which 
> > might just be from driving an 1800 lb car that fast. 
> > 
> > Cured the overheating and actually had to tape the rad and oil cooler.  
> > After many laps the water was at 200 and the oil at 220.  Outside temp 
> > 65-70 degrees.
> > 
> > Our new problem is we burned the electrodes off of number 1 and 4 plugs. 
> > The other four looked a little lean, but not bad.  We are running 1.50 
> > Strombergs.
> > 
> > It seems to me that the stock intake is starving 1 and 4. 
> > 
> > I've read that Kas drilled the float jets to cure starvation at high RPM's, 
> > but what about the main jets.  Will this cause serious bog at mid-RPM's.  
> > Also would reworking the number 1 and 4 intake runners help the problem.  
> > We are maxing out at 6000 RPM's.
> > 
> > As for the minor vibration, we have a rebuilt, fully welded 3:89. 
> > 
> > Planning on Elkhart in the Spring. Any ideas?
> > 
> > Thanks
> > 
> > Dave and Alex Amys
> > 
> > 
> > 
> >  
> > 
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> > 
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> > 
> > 
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> > 
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> 

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