Power increase with a weber 32/34 dmtl?

Hi guys, I have a standard 1.8 Mk2 rocco running a Weber 32/34 carb. I'm taking it to a rolling road on Wednesday to be set up properly, should I be looking at a power increase above standard. I believe it was only 90bhp.

I had the carb fitted and set up by the same company before but they did a naff job. They stripped and rebuilt the carb and then when they re-fitted the carb it was loose on its gasket. They also melted 'T' pieces to seal them off and screwed bolts into the ends of vaccuum hoses to seal them too.

Not best impressed!

Anyway, rant over, any advice would be great. Thanks

 

You might see one or two hp over stock with the weber if it's sound and healthy, not a whole heap though. The advantage of the weber is that it's simple and reliable compared to the monstrosity of the peiburg. You have the manual choke conversion too, I guess?

Nowt wrong with shoving bolts up vacuum hoses - I do it all the time If you're so disillusioned with the garages mechanical expertise, why are you going back?

 

yeah same as what he said..no much over a working carb

if yours is badly set up /broken then it might seem like a nice improvement , well worth having because theyre so simple to tune

 

Could be a small gain over standard. Probably depends more on the rolling road than anything else. For understandable reasons, there's a lot of variation from one to the next, I believe.

 

The DMTL gives a sharper throttle response than the 2E2, but don't expect much in the way of power increase on a standard engine.
TBH I got tired of my DMTL and went back to a well set up 2E2, fuel economy was better and it went just as well, just didn't have that nice induction growl.

 

Thanks guys, that clears things up for me a bit.

The only reason I'm going back to the garage is because they are putting things right for no charge. They were recommended to me and seem to have a good reputation, maybe it was an off day. Plus there isn't another rolling road for miles with mechs that will play with carbs.

Should thread lock be used when fixing the baseplate and carb down?

Thanks for the help.

Andy

 

You shouldn't need threadlock, I never had any problems without.

 

Ace. Thanks for your help.

 

I'm happy! She made 80 at the wheels, then the chappy told me to add 20-25% for the fly wheel power. So..... doing my maths........ im looking at between 96 and 100 whp.

Ace. Thanks for all the help gents

 

It's between 96 and 100BHP if it made 80 at the wheels.

To be honest I think a bit more tinkering can be done there, possible a little down on power.

 

really? Its only supposed to be 90 at the fly wheel standard. Im open to suggestions though

 

I'd be happy with that if it's otherwise standard.

 

That's pretty good power if it's standard except for the carb. What was the torque figure?

 

Just the way you said it, thought you mixed it up a bit.

I'd stick a K-Jet dizzy and GTi cam in, no dyno will be able to run it though

 

yeah, and do the next run with the rear seats folded down too

Seriously though, that's good figures, sounds like you've got a fairly happy engine.

 

Nothing will stop it with the seats folded down! That's probably the best weight reduction you can do.

 

On the Streamline Rolling Road day, we seemed to have a fairly consistent figure of 18% transmission losses for 020 gearbox cars.

80 x 1.18 = 94.4

Do the torque and power plots cross at 5250 rpm on your printout?

 

I think my transmission loss was calculated as 15%, 102bhp at the wheels and 120bhp at the flywheel.