Can someone help me understand why.....

[Racefan_uk]

I'd have thought that getting all the expensive work done will be a waste of time until you get the carbs sorted anyway. You may well find that once you've got them checked and working properly you don't actually need to have all the work done anyway.
Just a thought. But you've had plenty of advice from people in the know on here already.

[thewave]

Racefan_uk said:

I'd have thought that getting all the expensive work done will be a waste of time until you get the carbs sorted anyway. You may well find that once you've got them checked and working properly you don't actually need to have all the work done anyway.
Just a thought. But you've had plenty of advice from people in the know on here already.

I'm just fed up getting left behind on the track days

[hornetrider]

Therefore you should get the intial problem looked at before you do any more in depth work, imo.

[JP_Midget]

Those expensive mods don't really sound like they will add anything much to the output of your engine, they will make it stronger though.

I've read your later comments about it not revving in neutral when you plant your foot. The webber carbs squirt fuel when the pedal is pressed, so the sudden opening of the butterflies doesn't cause the mixture to lean out before the fuel flow through the certain tubes of the carbs can catch up.

With the engine off, take the filters off (might be able to do with these on), and have some one press the pedal for you, you should be able to hear/see the fuel being squirted. If it's this bad I doubt there will be any.

MGMotorsport are up the road from me, and Doug is a very nice chap. If you're not far away I'd give him a ring and see if he'll have a look; might be able to diagnose the problem without a rolling road session, but I would suggest that one is probably needed for peace of mind at least. I know a highly recommended chap down near Winchester, which I've used for A-series tuning, but I don't know if he's experienced in the MGC engine.

[pikeyboy]

give peter burgess a ring, nice bloke and very knowlegdable, MGB guru but also knows a thing or two about C's i'd wager

[thewave]

I appreciate the mods are expensive, and won't on their own make it any more powerful, but I can use the bigger jets in the webers then, at which point they'd need tuning again anyway.

I think the engine needs to be stronger, it's only used primarily as a track day car and shows, so need it to last.

[JP_Midget]

thewave said:

I appreciate the mods are expensive, and won't on their own make it any more powerful, but I can use the bigger jets in the webers then, at which point they'd need tuning again anyway.

I think the engine needs to be stronger, it's only used primarily as a track day car and shows, so need it to last.

Changing the jets is tuning, and these things don't wear as I understand it. So, if the car was set-up correctly when the mods were carried out, it should be running correctly now. It does some like an accelerator pump issue (but I'm not an expert on carbs).

I take it that you're getting some info from somewhere else as to the need for a stronger bottom end? Since it's a Pete Burgess head, get him on the phone and ask him whether the power gained from it would require upgrading the bottom end, he ought to know the type of other upgrades people that fit them do. He offers free rolling road time to set up his work usually, so might remember or have records of your car; or even offer to have a look over it for you.

I'd try to see if I could find the problem with the current set-up first before I went to the expense you're contemplating, rather than upgrading the bottom end and still having to find the original problem.

[thewave]

JP_Midget said:

thewave said:

I appreciate the mods are expensive, and won't on their own make it any more powerful, but I can use the bigger jets in the webers then, at which point they'd need tuning again anyway.

I think the engine needs to be stronger, it's only used primarily as a track day car and shows, so need it to last.

Changing the jets is tuning, and these things don't wear as I understand it. So, if the car was set-up correctly when the mods were carried out, it should be running correctly now. It does some like an accelerator pump issue (but I'm not an expert on carbs).

I take it that you're getting some info from somewhere else as to the need for a stronger bottom end? Since it's a Pete Burgess head, get him on the phone and ask him whether the power gained from it would require upgrading the bottom end, he ought to know the type of other upgrades people that fit them do. He offers free rolling road time to set up his work usually, so might remember or have records of your car; or even offer to have a look over it for you.

I'd try to see if I could find the problem with the current set-up first before I went to the expense you're contemplating, rather than upgrading the bottom end and still having to find the original problem.

I've contacted Denis Welch, and will contact PB aswell, to see what they recommend. Thanks