Thunderbird Frame Hole Help

72Combat

Joined

Jan 4, 2011

Messages

567

• Aug 11, 2014

• #1

I have a non Thunderbird frame that does not have the hole for the SU carb.
Its unlikely I'll find a frame here so might just convert the one I have.
Would anyone have one that they could give me the measurements and or a copy of a tracing?
Exhibit A:

Exhibit B is the bike:

Picked it up as an unfinished project, mostly there except the outer chain case, the SU carb. Its a 1953.
Motor is usual " was rebuilt but no docs"
Cheers John

 

M

Matt Spencer

Joined

Jul 25, 2010

Messages

5,865

• Aug 26, 2014

• #2

Just fit a Dual Carb Head . :wink:

originality at the price of degressin isnt worth pusueing . A T - bird should be a 100 mph road bike .

Who Cares , as long as its got a Air Filter , like a K&N or whatever . Seeing You Asked . dont mess with a running piece , its Stronger perhaps as is . not worth the hassle Its How it GOES that Counts . Its a TRIUMPH . not a vase
or something .

 

Triton Thrasher

Joined

Feb 10, 2009

Messages

2,978

• Aug 27, 2014

• #3

I've never heard of anyone wanting to do that.

SU carburettors are nice, but not worth re-engineering your frame for.

 

T

Tim_S

Joined

Aug 24, 2010

Messages

409

• Sep 16, 2014

• #4

Better late than never I suppose ........I measured the outside diameter of my rubber hose to the vokes air box at 42mm OD.

Tim_S

 

grandpaul

VIP MEMBER

Joined

Jan 15, 2008

Messages

13,588

• Sep 17, 2014

• #5

Many single carbs will still fit without the hole in the frame (bad idea from the start)

 

grandpaul

VIP MEMBER

Joined

Jan 15, 2008

Messages

13,588

• Sep 17, 2014

• #6

This is a '53 with the hole, but I bypassed it using a modern JRC superior carb.

 

72Combat

Joined

Jan 4, 2011

Messages

567

• Oct 9, 2014

• #7

Thanks for the comments.
I placed an add in the Vintage Car Club mag, see if I can get a frame.
Failing that , just put it together as it.

 

acotrel

Joined

Jun 30, 2012

Messages

14,015

• Jan 11, 2015

• #8

It would be very difficult to re-engineer the frame in a way which would not be visually detectable and I would have thought the reason for using the SU carburettor is to keep originality. You might be better to simply fit the Type 6 Amal carburettor which was used on many Thunderbirds.

 

72Combat

Joined

Jan 4, 2011

Messages

567

• Jan 12, 2015

• #9

Probably, I'm not in a hurry as the Commando ticks the Brit bike box and having too much fun riding my 900ss and BMW's.
I might put a Bing carb on it :lol: