M20B27 on LPG - Developments

Post Thu Jul 07, 2011 11:13 am

[/quote]

'They say not to touch?' ignore that.

On the R90 there's a smaller brass adjuster, which comes screwed in and should generally be left there as it lets as in at idle only and has no effect thereater, I assume that your vapourisor gets as hot as the coolant, and that your engine thermostat is in good working order?

The larger brass adjuster controls the mixture, as you're lean at the top you should start unscrewing it 1/4 turn at a time.

If this shows no impovements then you need to consider the size of the LPG pipe running front to rear, is it just 6mm copper, if so it's possibly not big enough? How old are your LPG filters and vapourisor, they don't last forever.

I took my shaft out and it measures 9mm, although this part is never actually exposed by the trap door.[/quote]

yes vap gets hot very quickly, engine/cooling system is in top condition.
Vap is new, any adjustments (believe me ive done them all) make no difference at the top end, i think the pipe,filters etc can be ignore as when on open loop it runs fine no hint of running lean and can make it run very rich all the way thru with no problems.
still convinced its a problem with the blos carb

Post Thu Jul 07, 2011 1:01 pm

Best take the top off of the BLOS and cack the diaphram.

How's the BLOS mounted, could you take your air filter off and see the trap door, ie check that it opens fully when the engine is revved hard.

Post Fri Jul 15, 2011 11:28 pm

Post Sat Jul 16, 2011 3:58 pm

StuBeeDoo wrote:According to my LC-1, it's actually running a bit rich, but I'm loathe to weaken it as it's going so well.

this is exactly my thinking at the moment.. lol. Nice to see some more good results

Post Sat Jul 16, 2011 4:49 pm

CHR1S1990 wrote:
StuBeeDoo wrote:According to my LC-1, it's actually running a bit rich, but I'm loathe to weaken it as it's going so well.
this is exactly my thinking at the moment.. lol. Nice to see some more good results

IIRC, mine is between 13.5:1 and 15.0:1 right through the rev range.

When I fitted the AFM in place of the MAF, I had to screw the adjuster on the BLOS in quite a way, although I had something like 14.0 - 16.5 with the MAF.

I don't think the adjuster will go in much further, so I'm kind of thinking that maybe I should try to get hold of one of the "economy" metering tubes.
....... But then I'll be back to constant fiddling again. So I'm going to wait a while before making any decision.