Twin SU's
Forum rules
By using this site, you agree to our rules. Please see: Terms of Use
By using this site, you agree to our rules. Please see: Terms of Use
-
- Series MM Registrar
- Posts: 10183
- Joined: Sun Jul 24, 2005 11:39 pm
- Location: Reading
- MMOC Member: No
Very nice installation. You've even used new nuts and bolts!
I see what you mean by the rear float chamber would be close to the exhaust pipe. Maybe with a 4 branch and some spacers you would have room for it, but then it might be too close to the bulkhead crossmember. I think it definately needs a heat shield.
I have a couple of old carbs and a twin carb inlet manifold I will have a play with them.
When I put the twin carb Midget engine in the Traveller I needed extra spacers to clear the 3 branch exhaust and then there was only just room for the K&N filter next to the wiper motor
I see what you mean by the rear float chamber would be close to the exhaust pipe. Maybe with a 4 branch and some spacers you would have room for it, but then it might be too close to the bulkhead crossmember. I think it definately needs a heat shield.
I have a couple of old carbs and a twin carb inlet manifold I will have a play with them.
When I put the twin carb Midget engine in the Traveller I needed extra spacers to clear the 3 branch exhaust and then there was only just room for the K&N filter next to the wiper motor
[sig]3580[/sig]
-
- Minor Legend
- Posts: 2646
- Joined: Thu May 11, 2006 10:34 am
- Location: Cardiff
- MMOC Member: Yes
I have the same carbs but with zero degree float chambers and longer, by about an inch or two, inlet tracts. Might be possible to get a heatshield in there more easily with the carbs further outboard plus you'd have a better chance of having a bunch-of-bananas exhaust manifold under there.
Doesn't detract from the fact that your kit looks like the Mutts Nuts!!!<br><br>
Doesn't detract from the fact that your kit looks like the Mutts Nuts!!!<br><br>
-
- Minor Legend
- Posts: 2646
- Joined: Thu May 11, 2006 10:34 am
- Location: Cardiff
- MMOC Member: Yes
Having the middle 2 exhaust stubs come outboard more will allow all 4 pipes to be of equal length which aids exhaust pulse extraction (In theory?) There is enough of a gap at the rear for a float chamber to fit between the carb body and the crossmember without getting smacked but it won't work if the exhaust manifold is the standard item.
Keith. Do you have a photo of the Burgess/Derrington item that you were thinking of having copied?
Cheers
Keith. Do you have a photo of the Burgess/Derrington item that you were thinking of having copied?
Cheers
Cardiff, UK
-
- Minor Legend
- Posts: 1438
- Joined: Tue Jan 30, 2007 10:09 pm
- Location: Essex
- MMOC Member: No
Mike, you kmow what happens when you start to have a play!
Rob, I am sure that there was space to fit float chambers outboard of the carb bodies (dont forget mine are inlined up) but it seemed neater to have them inboard - I shall see how the heat affects them once 'summer' arrives!
As the subject of exhaust has been raised, Keith, is there any news about the 4 branch copies yet?
Rob, I am sure that there was space to fit float chambers outboard of the carb bodies (dont forget mine are inlined up) but it seemed neater to have them inboard - I shall see how the heat affects them once 'summer' arrives!
As the subject of exhaust has been raised, Keith, is there any news about the 4 branch copies yet?
-
- Series MM Registrar
- Posts: 10183
- Joined: Sun Jul 24, 2005 11:39 pm
- Location: Reading
- MMOC Member: No
Alan,
Can you make it to the Series MM rally, it would be great to see your car and compare notes. There should be a selection of tuned MMs, Alex from Minor Mania is booked in with his Derrington, Graham should be there with his Alta and of course Keith will have his supercharged MM. I'll see what I can put together out of my box of bits.
The thing that is stopping me fitting twins is that I am very reluctent to start hacking my only manifold about and the fact that I can never get the carbs on the Midget engine properly balanced.
Can you make it to the Series MM rally, it would be great to see your car and compare notes. There should be a selection of tuned MMs, Alex from Minor Mania is booked in with his Derrington, Graham should be there with his Alta and of course Keith will have his supercharged MM. I'll see what I can put together out of my box of bits.
The thing that is stopping me fitting twins is that I am very reluctent to start hacking my only manifold about and the fact that I can never get the carbs on the Midget engine properly balanced.
[sig]3580[/sig]
-
- Minor Legend
- Posts: 1438
- Joined: Tue Jan 30, 2007 10:09 pm
- Location: Essex
- MMOC Member: No
-
- Series MM Registrar
- Posts: 10183
- Joined: Sun Jul 24, 2005 11:39 pm
- Location: Reading
- MMOC Member: No
well i have built my manifolds, linkages and adapted the airfilters
here is the finished result (almost, not shown are the manifolds i made up)
currently looking very nice bolted to the engine (shiniest parts in there)
Has there been any consensus as to what the "best" needles to use are? I currently have EK needles
here is the finished result (almost, not shown are the manifolds i made up)
currently looking very nice bolted to the engine (shiniest parts in there)
Has there been any consensus as to what the "best" needles to use are? I currently have EK needles
-
- Series MM Registrar
- Posts: 10183
- Joined: Sun Jul 24, 2005 11:39 pm
- Location: Reading
- MMOC Member: No
Ek are the strange profile standard needles but my preference is for M9s on the basis that they are richer at the top end but you don't need to use the top end unless you want to put your foot down.
If you go to http://www.mintylamb.co.uk/suneedle and enter the needle codes it will show you the comparative profiles.
If you go to http://www.mintylamb.co.uk/suneedle and enter the needle codes it will show you the comparative profiles.
[sig]3580[/sig]
-
- Minor Legend
- Posts: 1438
- Joined: Tue Jan 30, 2007 10:09 pm
- Location: Essex
- MMOC Member: No
Good link Mike, it really shows what a lot of words couldn't!
With my setup I started with the original EK's but have since fitted M9's and found them much better all round. I found to get a correct running mixture (as indicated by plug colour) the idle mixture was too rich - which is now much improved.
Your setup will probably totally different, but I have ended up with both jets wound down '6 flats' from the fully up position.
With my setup I started with the original EK's but have since fitted M9's and found them much better all round. I found to get a correct running mixture (as indicated by plug colour) the idle mixture was too rich - which is now much improved.
Your setup will probably totally different, but I have ended up with both jets wound down '6 flats' from the fully up position.
-
- Minor Legend
- Posts: 1438
- Joined: Tue Jan 30, 2007 10:09 pm
- Location: Essex
- MMOC Member: No
-
- Minor Legend
- Posts: 1438
- Joined: Tue Jan 30, 2007 10:09 pm
- Location: Essex
- MMOC Member: No