[Fot] TR4 spitting thru Webers - haaaalp!

[Bud R]

Spitting back could mean the mixture is too lean or possibly a vacuum leak. Have you checked for vac leaks with carb cleaner, there was a TR4 recently at a race that had a leak at the intake manifold gasket that was easily found by spraying carb cleaner.

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 Aug 23, 2015, at 6:14 PM, J.C. Hassall <jhassall at gmail.com> wrote:

> My TR4 spits thru the 40DCOEs at idle and speed.  Timing is set to 32 degrees at 3K RPM, so idle is about 12 degrees.  I thought that spitting thru the carbs meant too much advance, but I believe timing is ok.
> 
> The AFR (sensor is in the 4-1 collector - bad idea) at idle jumps between 13.8 and 15.3 (seems like an enormous swing!).  Spitting doesn't seem to coincide with any specific AFR.  The carbs have been synched, etc.  34 chokes, 50F9 idle jets, mains are 120 with 200 air correctors.  The mains seem awfully small.  Even so, the AFR at speed is 12.8-13.5.  Plugs are NGK BP6HS, which are sooty; the ground lug burns clean about half way.
> 
> What am I doing wrong???  I'm at the end of my wit (you're right Craig, it's a very short walk)
> 
> tnx
> 
> jim
> 
> 63 TR4 in autox prep, 99.5% finished, 90% to go
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