Irving Vincent Four Valve Engine

[Deleted member 1085]

All good points reflecting on my brief tantrum . And noted . For a moment it did seem like jtan . UGH . Just what I left behind .
Meant in no way to slight others way of enjoying their Vincents . A ridiculous thought . Sid .

There is nothing wrong with jtan, this forum or many others as such, it's the posts and people who make it.

 

[Bill Thomas]

Hello Sid, When I was playing with the old type concentric, I tried opening the float needle hole, Like they do for methanol, It didn't help me, I wonder if the trouble is petrol getting past the main needle and needle jet when flat out, Is there some kind of flow test for petrol ? It must be hard to tell without the motor running. Good luck with your hospital trip, Cheers Bill.

 

[Big Sid]

I've often wanted to go back to jtan , had many friends there I missed , but unpleasant memories stopped me . There were many who offered much good stuff one could learn from . Sid .

 

[Big Sid]

Thanks for your kind words Bill . Never fun in the bone yard ! And you feel so cut off from others .
An interesting point re the fuel flow rate . Did you also add a second hole in the bowl entry banjo bolt ? And enlarge the opening right below the float needle orifice , the drilling in the bowl casting itself pointing up towards the needle tip ? Both of these passages
limit flow . What fuel used , what size main jet ? Sid .

 

[Bill Thomas]

Sorry Sid, It was a long time ago, People said , You needed twin feed pipes, Or the petrol tap was too small, It made me mad, So I gave up and went to gardners With no float, Straight from the tank !! Good Luck, Bill.

 

[clevtrev]

Thanks for your kind words Bill . Never fun in the bone yard ! And you feel so cut off from others .
An interesting point re the fuel flow rate . Did you also add a second hole in the bowl entry banjo bolt ? And enlarge the opening right below the float needle orifice , the drilling in the bowl casting itself pointing up towards the needle tip ? Both of these passages
limit flow . What fuel used , what size main jet ? Sid .

Are you telling us the fuel flow was no good, when you were getting 125MPH on the road ? If that were the case, you may have changed something when you went to the track. Something other than taking the road gear off. 20% less speed is a bit of a puzzle.

 

[Big Sid]

You misread . The Vincati was showing that , the 600 close behind . Stephen Pâté was on the Vincati , ask him . Five of our own Vincent s were on a group ride that day , all going like the clappers , can vouch for my story . Sid .

 

[Big Sid]

Bill , your experiance with the Gardners was satisfactory ? Your port size and the Gardner size was ? Sid .

 

[Bill Thomas]

Hello Sid, At that time, It was 32mm Port and carb', The bike went from 110 mph concentric, To 130mph Gardner on Flying 1/4 mile, This was in the road class, But with open exhaust, Mk11 cams and big pistons, Cheers Bill. Trev' Be nice !!.

 

[Big Sid]

On that group ride it was Ian Barry of Falcon Motors up on the 600 , his FIRST ride on a Vincent and going like blazes !
Never a fouled plug or any other problem with any of our bikes , all returned with nary a whimper still running sweet as a nut . Sid .