Author Topic: Carburettor Studs in Cylinder Head  (Read 463 times)

Offline UKlittleguns

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Carburettor Studs in Cylinder Head
« on: 14.04. 2020 14:13 »
Hi Everybody,

The carburetter stud holes in in my 58 iron cylinder head go straight through into the cylinder inlet passages.  The studs would normally block these passages but one stud has a a one mill groove along its length that might provide an air bleed or whatever.
Has anybody seen this before? 

Best Regards

Online RDfella

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Re: Carburettor Studs in Cylinder Head
« Reply #1 on: 14.04. 2020 15:58 »
Perhaps an old banjo bolt someone's cut the head off?
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Online Greybeard

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Re: Carburettor Studs in Cylinder Head
« Reply #2 on: 15.04. 2020 23:13 »
Hi Everybody,

The carburetter stud holes in in my 58 iron cylinder head go straight through into the cylinder inlet passages.  The studs would normally block these passages but one stud has a a one mill groove along its length that might provide an air bleed or whatever.
Has anybody seen this before? 

Best Regards
I cannot answer your question, sorry. On my Plungie, I have bolts, not studs. Means I can get the carb off without removing the cylinder head.
Greybeard (Neil)
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Offline UKlittleguns

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Re: Carburettor Studs in Cylinder Head
« Reply #3 on: 16.04. 2020 12:03 »
Hi Everybody,

Thanks for all that.  I suspect that at some point in the engines history somebody was indeed trying to deal with a blow-by/breather problem.  I have 3 rocker covers and one of them has been drilled and fitted with a pipe nipple.  None of this is going to be replicated in this new rebuild.  I have 2 questions.

Is it normal for the stud holes to break through into the inlet tracts?

Are bolts better than studs for the carburetter?  Neil's comment would appear to make a lot of sense but I've never had the engine in the frame as yet.

Best Regards,

Len


Online JulianS

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Re: Carburettor Studs in Cylinder Head
« Reply #4 on: 16.04. 2020 12:11 »
Yes they break through, it is quite usual.

Studs OK with a screw on air filter or bell mouth but if using the original type you need bolts. Space very limited to manouver carb over studs and connect to rubber hose/air filter.

Online Greybeard

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Re: Carburettor Studs in Cylinder Head
« Reply #5 on: 16.04. 2020 12:51 »
The holes go through into the inlet tract on mine.
Greybeard (Neil)
1955 Golden Flash, sprung frame
Supporter of THE DISTINGUISHED GENTLEMAN'S RIDE https://www.gentlemansride.com

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A Distinguished Gentleman Riding his 1955 Plunger Golden Flash

Offline UKlittleguns

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Re: Carburettor Studs in Cylinder Head
« Reply #6 on: 16.04. 2020 17:47 »
Thanks for that everybody.  Now I know my head is normal and the old studs are in the bin in favor of bolts.
Best regards,
Len

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Re: Carburettor Studs in Cylinder Head
« Reply #7 on: 17.04. 2020 12:26 »
...Now I know my head is normal...
You own an ancient motorbike, of course your head isn't normal!  *smile*
Greybeard (Neil)
1955 Golden Flash, sprung frame
Supporter of THE DISTINGUISHED GENTLEMAN'S RIDE https://www.gentlemansride.com

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A Distinguished Gentleman Riding his 1955 Plunger Golden Flash

Offline UKlittleguns

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Re: Carburettor Studs in Cylinder Head
« Reply #8 on: 18.04. 2020 22:17 »
Hi Everybody,

Neil's last comment really did make laugh out loud.  Just shows how careful you have to be with your choice of words and how an astute mind works.  Well said Neil!  Laughs are badly needed in current times.  Now I'm going to read this 10 times before I press the post button *smile*

Online BigJim

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Re: Carburettor Studs in Cylinder Head
« Reply #9 on: 19.04. 2020 00:05 »
 UKLittleguns this was quite clean (non filth) for GB. Lots of words used in your post have potential for misunderstanding and hoorah for humour by golly we need it.
 ::hh:: *good3* *beer* *whistle*
Jamie,  Supporter of Distinguished Gentleman's Ride

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Re: Carburettor Studs in Cylinder Head
« Reply #10 on: 19.04. 2020 14:22 »
We aim to please!
Greybeard (Neil)
1955 Golden Flash, sprung frame
Supporter of THE DISTINGUISHED GENTLEMAN'S RIDE https://www.gentlemansride.com

Warwickshire UK


A Distinguished Gentleman Riding his 1955 Plunger Golden Flash