50 T-Bird

See cars and bikes being built for the salt

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Mossy
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Location: Pt Augusta

Re: 50 T-Bird

Post by Mossy » Sun Feb 16, 2014 6:20 pm

Fired up the Thunderbird today, first time since speedweek last year.
Got a bit of tuning to do once we get to the lake but other than that we're ready to go. New mods for this year are a different head with T140 inlet valves and the twin carbs, pictured below.

Image

I am so looking forward to going for a ride on the salt again :D :D :D

Cheers Mossy
DLRA # 959

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gennyshovel
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Location: Broken Hill

Re: 50 T-Bird

Post by gennyshovel » Sun Feb 16, 2014 9:15 pm

I'm envious Mossy, I attempted another test 'n ' tune ride today, 8 hrs later,discovered a crook coil (it could have been a LOT worse)
MAGGY'S RULE !
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering

Mossy
Posts: 187
Joined: Thu Jun 24, 2010 4:57 pm
Location: Pt Augusta

Re: 50 T-Bird

Post by Mossy » Sat Mar 28, 2015 6:22 pm

Meant to do this a couple of weeks ago but I was a bit disorganised this year.
After running 110 mph last year I was aiming for around 115 mph this year.
Engine wise I replaced the 3134 cams with T140 inlet cams. Only other mods were repositioning the tacho so I could see it better when crouched down and rubber mounting the oil tank.
Took it to Waikerie in November for some testing which was far from satisfactory so I visited Darren Wauchope at Flinders Dyno, operating out of Flinders Motorcycles in Pt Pirie.
First session got it running a lot better than it was at Waikerie but it did show the carbs were flooding over 4,000 rpm.
New bowls and new rubber tipped float needles cured that problem and we then got it tuned up on the 1 1/2"pipes with reverse cone meggas to produce 48.4 hp.
Then tried a couple of old drag pipes I took along which increased power to 49.6 hp with no other changes so that's how we run this year.
First run on the salt Tuesday morning saw the engine pulling well over 6,500 rpm, which was the limit last year, however clutch slip limited the top speed to 110 mph still.
So it was back to the pits for an engine sprocket change and to screw up the clutch spring nuts.
Back on track 2 in the afternoon and did a run of 119.002 mph. :D :D :D :D
As that was well above the goal for this year I was happy with that and called it quits for this year. However with another gearing change and a couple of other little mods for next year, I'll be looking to crack the 125 mph mark.
Image

Cheers Mossy
DLRA # 959

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gennyshovel
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Re: 50 T-Bird

Post by gennyshovel » Sat Mar 28, 2015 6:44 pm

Well done Mossy
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering

harky
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Joined: Fri Feb 09, 2007 9:03 am
Location: Adelaide

Re: 50 T-Bird

Post by harky » Sat Mar 28, 2015 6:53 pm

HRD s make the pinicle of noise ----------but yours was a close second -------you should be happy with your runs !!
faster ----for us all next year !!!!
360 ish days to go
harky
harky
DLRA #643
so far 120mph for$2000---imagine how fast I can go for $20,000

Mossy
Posts: 187
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Location: Pt Augusta

Re: 50 T-Bird

Post by Mossy » Sun Mar 29, 2015 9:40 am

Thanks, I'm Very Happy with this years run :D :D :D :D
Cheers Mossy
DLRA # 959

Mossy
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Location: Pt Augusta

Re: 50 T-Bird

Post by Mossy » Tue Jan 19, 2016 7:53 am

Performance mod for this has consisted of changing the oil tank colour from black to yellow :-)
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RGV
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Location: Adelaide Hills

Re: 50 T-Bird

Post by RGV » Tue Jan 19, 2016 7:59 am

Ya cant have too much Yellow Mossy.

See ya on the salt.

Dave

Last Minute Racing "its a 2-stroke ya twit - Its supposed to smoke"
DLRA #928
SATA #10

2010 MPS/G 250 118 MPH:)
2011 Washed Out:(
2012 Washed Out:(
2013 MPS/G 250 131 MPH (RECORD):)
2014 MPS/G 250 140 MPH (RECORD):)
2015 MPS/F 250 DNF:(

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gennyshovel
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Re: 50 T-Bird

Post by gennyshovel » Tue Jan 19, 2016 8:37 am

I like the secret oil tank aero mods Mossy, & no, the yellow didn't disguise it
Tiny DLRA# 484
Postiebike Racing , created & funded by TwoBob Engineering

mal hewett
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Joined: Mon Feb 27, 2006 2:52 pm
Location: roxby downs

Re: 50 T-Bird

Post by mal hewett » Tue Jan 19, 2016 1:17 pm

Yep yellow is faster for sure Mossy :)
Mal Hewett
#234

Mossy
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Location: Pt Augusta

Re: 50 T-Bird

Post by Mossy » Wed Feb 03, 2016 9:24 am

Final bit of tuning for this years Speedweek :-) And just in case you're wondering why the build thread is 50 Tbird but the bike is now entered as a 54, its because when this build thread started I only had the rigid frame and a gearbox shell. But by the time the bike was finished it turned out to be 1954 spec, which was the last year of the rigid frame and the first year of the big bearing alternator type crankcases and 5 fin cast iron heads.
Cheers Mossy
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DLRA # 959

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