EXTREMELY poor fuel economy modified fc with 179 t700 auto

[john253a]

Glad to here your funding the happy medium

[Skuta]

Update time.

Looks like I might have got to the bottom of it. After a couple of dyno tunes and endless tweaking. I gave the car to my dad to have a play with and a fresh view on what could be going on. He was adamant that it has nothing to with the gearbox or diff ratios and has been toying with the carb (much to my disgust after spending nearly a grand all up on dyno tuners) and he can't make it change tune by playing with the mixture, so after googling all night I have come up with what I think is the issue.

The carb is a Webber 32/36 brand new. I thought by buying a brand new carby I would bypass all the issues associated with second hand. What I failed to read in the fine print is that you are not to run any higher than 3.5 psi through them or they will overload the needle and seat.  So as soon as the shops open I'm off to purchase another solution (a fuel pressure regulator) . Wish me luck.

Edit : Just to add, I've seen that a stock fuel pump runs at between 3.5 and 4.5 psi.

Edit #2 just tried it... Ahh well its another nice piece of useless chrome under the bonnet. But I'm onto another lead, will update with progress, this one sounds promising. Most expensive 32/36 weber in Australia.

[Skuta]

Pulled the head off today, (should have done it a long time ago) Was happy to find it's a yella terra head, and find the source of my problems. We comp tested it about a week ago and found it ranges between 95 and 115 so head off to find the issue. Glazed bores! Yay. Rering it and off we go again.

[Skuta]

Well it looks like I'm back on the road today after 4 long months. I didn't reuse the 179 or the t700 auto. I got a 186 that had been completely rebuilt and never used with a mild cam and all the goodies. And I had a trimatic completely rebuilt to stick behind it. I got the head reconditioned (one of the exhaust valves had worked it's way up into the head) . We kicked it into life yesterday and today we'll tidy everything up and take it for a run. I've never been that deep into a motor before, just barrels and heads on motorbikes, so this was an experience and a great project with my dad.