Carburettor Dashpot

for those with Series MM sidevalve cars produced between September 1948 and February 1953
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alanworland
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Carburettor Dashpot

Post by alanworland »

I have just spent a bit of time making a new throttle spindle and re bushing the carb body as it was so worn it was untrue (130,000 miles)
Anyway it all fits quite nicely now and I am interested as to what others put in the dashpot, the Operations Manual refers to SAE 20 and I have always put in enine oil which is usually a 20-50 multigrade, could this be a bit thick?
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mike.perry
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Post by mike.perry »

I keep a small tin of 3 in 1 oil just for the dashpot. If you were very particular I suppose you would have one grade for summer use and one for winter use!
alanworland
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Post by alanworland »

3 in 1 seems very light I would guess at lighter than 20 grade? Does this create a flat spot on pulling away?
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Onne
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Post by Onne »

I use Burlen SU carb oil.

I know it's expensive at a fiver a go, but it lasts forever...
Onne van der S. MMOCno 60520 Moderator
2dr 1971 White DAF 55 (with hopefully a 1600cc engine soon)
2dr 1973 Bergina (DAF 44)
2dr Estate 1975 DAF 46 in red
2dr saloon 1972 DAF 44 in Mimosa
alanworland
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Post by alanworland »

Didn't know you could get SU Carb oil, how does it seem viscosity wise?
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Onne
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Post by Onne »

Not all that thick, just a bit thicker than 3 in 1
*Moderated by another moderator - you're not allowed as a moderator to say who sells it, Onne :( If, of course, you happened to mention it to somebody else and they happened to post it...*
Andrew
Onne van der S. MMOCno 60520 Moderator
2dr 1971 White DAF 55 (with hopefully a 1600cc engine soon)
2dr 1973 Bergina (DAF 44)
2dr Estate 1975 DAF 46 in red
2dr saloon 1972 DAF 44 in Mimosa
alex_holden
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Post by alex_holden »

Onne wrote:Not all that thick, just a bit thicker than 3 in 1
*Moderated by another moderator - you're not allowed as a moderator to say who sells it, Onne :( If, of course, you happened to mention it to somebody else and they happened to post it...*
Andrew
Um... I don't know what Onne said but I bought my bottle from ESM.

http://morrisminorspares.co.uk/shop/pro ... ts_id=2147
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Alex Holden - http://www.alexholden.net/
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bigginger
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Post by bigginger »

Well, who'd have thought it :D
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alanworland
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Post by alanworland »

I might order some next time I place an order, thanks
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chickenjohn
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Post by chickenjohn »

Yes, 3 in 1 works well as does the ESM oil- great suppliers BTW. Dont use 20W50 as my Trav seemed a little more sluggish and a slight pink on throttle opening- perhaps 20W50 is too thick and the piston does not rise quickly enough to richen the mixture. BTW, I use my Minor quite a bit so throttle response is important to me.
Cheers John - all comments IMHO
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Judge
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Post by Judge »

Onne wrote:Not all that thick, just a bit thicker than 3 in 1
*Moderated by another moderator - you're not allowed as a moderator to say who sells it, Onne :( If, of course, you happened to mention it to somebody else and they happened to post it...*
Andrew
???????????????????????????????
bigginger wrote:That really isn't too bad at all :D I've found ESM/Bull Motif to be good. Do be sure the area is still sound behind the post, and if it isn't, get one of these http://morrisminorspares.co.uk/shop/pop ... p?pID=2397 not one where there's an angle which is meant to cover the outside of the post. They don't seem to be on the ESM site any more, but that's what I ended up with :( PM sent too, btw
Naughty BG :wink:
bigginger
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Post by bigginger »

Yup - hypocrisy R us :D
Onne
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Post by Onne »

:)
Onne van der S. MMOCno 60520 Moderator
2dr 1971 White DAF 55 (with hopefully a 1600cc engine soon)
2dr 1973 Bergina (DAF 44)
2dr Estate 1975 DAF 46 in red
2dr saloon 1972 DAF 44 in Mimosa
alanworland
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Post by alanworland »

I thought that if the piston was slow to rise ie thicker oil that it caused the mixture to richen while it was rising, because of the extra suck across the carburettor bridge?
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mike.perry
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Post by mike.perry »

Lets just say that 3 in 1 does the job and my Series MM has numerous podium finishes in the traffic light grand prix to prove the point!!
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alanworland
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Post by alanworland »

I know what you mean, too much tyre smoke impedes rear vision!
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