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 Posted: Aug 30, 2014 07:35AM
 Edited:  Aug 30, 2014 07:51AM
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GR

guys believe it or not it was the float chamber seal!! it wouldnt leak but mouth blowing air from the inlet port and all the ports blocked it would leak out....

 Posted: Aug 30, 2014 06:39AM
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CA
Quote:
Originally Posted by malsal
Quote:
Originally Posted by dimitris

if the circled passage is blocked, wouldnt it cause bad ventilation of the chamber? or movement of the piston?

Circled passage vents the piston that holds the needle. The number 5 needs to vent to air with a hose attached to make sure no gas finds its way onto the exhaust manifold if it overflows.

Was this carb on the car before the problem started ?

Check the elbow gasket to make sure the circled passage is open. The elbow gasket typically comes with 5 holes - inlet, 2 bolts and 2 vent holes.

.

"Hang on a minute lads....I've got a great idea."

 Posted: Aug 29, 2014 09:25PM
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GR
Quote:

Was this carb on the car before the problem started ?

Mal no it was a spare carb that i decided to rebuilt, thought it was a good base. I swaped with the old one and it works like a charm!! i guess i need to bring it apart again..

 Posted: Aug 29, 2014 06:36PM
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Quote:
Originally Posted by dimitris

if the circled passage is blocked, wouldnt it cause bad ventilation of the chamber? or movement of the piston?

Circled passage vents the piston that holds the needle. The number 5 needs to vent to air with a hose attached to make sure no gas finds its way onto the exhaust manifold if it overflows.

Was this carb on the car before the problem started ?

If in doubt, flat out. Colin Mc Rae MBE 1968-2007.

Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.

 Posted: Aug 29, 2014 08:40AM
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GR

hmmm looks like this passage is blocked anyway! so i suspect the carb sucks air from somewhere else and affects the fuel feed...

 Posted: Aug 29, 2014 08:11AM
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GR

if the circled passage is blocked, wouldnt it cause bad ventilation of the chamber? or movement of the piston?

 Posted: Aug 29, 2014 07:58AM
 Edited:  Aug 29, 2014 07:59AM
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GR

The manifold indeed needed a bit of skimming to the inlets BUT when i plug no5 in the picture the problem disappears but after a while the engine stalls again! i know its supposed to be unplugged and ventilate the chamber but maybe leads to the real problem..?

 

 

 Posted: Aug 28, 2014 10:52AM
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GR
Quote:
Originally Posted by malsal

Is the carb clearing the bulkhead ?

yap everything is ok regarding clearance! Mal i'll skim the manifold and let you know, the machinist is a friend its free anyway! i've checked with the flat surface of a vernier and a 0.05mm filler. Some ports are flat some slip the filler right away!

 Posted: Aug 28, 2014 10:34AM
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Is the carb clearing the bulkhead ?

If in doubt, flat out. Colin Mc Rae MBE 1968-2007.

Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.

 Posted: Aug 28, 2014 09:51AM
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GR
Quote:
Originally Posted by malsal
Quote:

 Those manifolds do not warp easily as they are cast iron.

wanna place a bet on that??

 Posted: Aug 28, 2014 09:47AM
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Quote:
Originally Posted by dimitris

Mal they re still one piece!! but 40+ years old! I've seen everything happen, for the past month fighting with 40+ year old parts so i kinda feel you!

Then it can only be different angles on the manifold which is easy to see off the car or the carb hitting the bulkhead which is also easy to see. Those manifolds do not warp easily as they are cast iron.

If in doubt, flat out. Colin Mc Rae MBE 1968-2007.

Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.

 Posted: Aug 28, 2014 09:29AM
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GR

Mal they re still one piece!! but 40+ years old! I've seen everything happen, for the past month fighting with 40+ year old parts so i kinda feel you!

 Posted: Aug 28, 2014 09:23AM
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Quote:
Originally Posted by dimitris

Malcolm i'm taking both manifolds at my local machinist tomorrow for inspection! Is it a good idea to skim just enough to flat out? Are they supposed to be totally flat from one side to the other or slightly curved?

Totally flat. You should be able to see with a straight edge if they are distorted. Are the manifolds still one piece or have they been seperated ?????? The reason i ask is when they are one piece the studs aligh everything up, if they have been seperated it is guess work to align the inlet as it does not have the locating rings in the ports like the twin car set up has (ask me how i know). When you remove it look at the gasket and see if all the port holes are "centered" with enough of the intake covering the edges.

If in doubt, flat out. Colin Mc Rae MBE 1968-2007.

Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.

 Posted: Aug 28, 2014 09:11AM
 Edited:  Aug 28, 2014 09:14AM
Total posts: 2022
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GR

Malcolm i'm taking both manifolds at my local machinist tomorrow for inspection! Is it a good idea to skim just enough to flat out? Are they supposed to be totally flat from one side to the other or slightly curved?

 Posted: Aug 28, 2014 08:57AM
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Quote:
Originally Posted by dimitris

this is my set up running fine for over 6 years now! the thing is i had two manifolds painted the same colour and cant remember which is which! is it possible that the manifold bended somehow? or the flat surface of the ports? 

 

That is a HS4 1.5" manifold used on the 998's > but maybe in some markets used on the 850's. It is possible that the two manifolds have different angles, some of the A series are 20 degrees and some are 30 degrees depending on Mini or Spridget applications (this applied mainly to twin carb set ups).

I would take the manifold off and compare it side by side with the other one and also check to see if the base of the carb is hitting the bulkhead. I am presuming that the exhaust and inlet manifolds are still one piece.

 

 

 

 

 

 

 

 

 

 

If in doubt, flat out. Colin Mc Rae MBE 1968-2007.

Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.

 Posted: Aug 28, 2014 07:40AM
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GR

this is my set up running fine for over 6 years now! the thing is i had two manifolds painted the same colour and cant remember which is which! is it possible that the manifold bended somehow? or the flat surface of the ports? 

 

 Posted: Aug 28, 2014 06:02AM
 Edited:  Aug 28, 2014 06:34AM
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Brad may have something there Dimitris. How is the HIF 38 bolting up to the standard HS2 850 intake manifold as the bolt pattern is different, are you using an adapter pushing the carb closer to the bulkhead ? When the Mini's converted over to HIF's they moved the engine forward in the frame about 1 inch and used a longer steady bar so the HIF would clear the bulkhead.

If in doubt, flat out. Colin Mc Rae MBE 1968-2007.

Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.

 Posted: Aug 28, 2014 05:48AM
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US

How much gap do you have from the bottom of the carb to the flat area of the bulkhead? Was the HIF38 already on the car and running well before you rebuilt it?

"How can anything bigger be mini?"

 Posted: Aug 28, 2014 05:19AM
 Edited:  Aug 28, 2014 05:21AM
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GR
Quote:
Originally Posted by Willie_B

Make sure that the intake and exhaust manifolds are the same thickness. If they are not then the washer will not apply even pressure against one and it will not seal.

Have you changed anything else leading up to this problem. New carb that may be bottoming out on the bulkhead and tilting the intake.

Brad i've got the standard 850 inlet/exhaust manifold and the standard inlet/exhaust gasket. I rebuilted the carb(hif38) recently with a new repair kit. Bolted at 22nm as the manual says! I've tryied to go further by hand tightening but it still revs up when i spray carb cleaner to the inlet ports!.. Thanks for the pics!!!! it looks like you re using washers only for the inlet?

 Posted: Aug 28, 2014 05:09AM
 Edited:  Aug 28, 2014 05:15AM
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US
Image Gallery

Make sure that the intake and exhaust manifolds are the same thickness. If they are not then the washer will not apply even pressure against one and it will not seal.

Have you changed anything else leading up to this problem. New intake or carb that may be bottoming out on the bulkhead and tilting the intake.

"How can anything bigger be mini?"

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