Posts: 6,432
Joined: October 2012
|
|
Forums35
Topics76,562
Posts776,574
Members12,215
|
Most Online204 Jul 10th, 2022
|
|
|
Joined: Jul 2012
Posts: 462 Likes: 36
Britbike forum member
|
Britbike forum member
Joined: Jul 2012
Posts: 462 Likes: 36 |
|
|
|
|
Joined: Jan 2014
Posts: 2,173 Likes: 376
Britbike forum member
|
OP
Britbike forum member
Joined: Jan 2014
Posts: 2,173 Likes: 376 |
Hi John Motor seems quiet sweet, much quieter as far as top end noise is concerned. I've fitted one of my ignitions on so i can change the timing map, uses the Boyer or Pazon trigger setup. Wants a sharper advance curve i think. We'll test and set it up at the track in April. Just have to remember to take my laptop......... Nick
|
|
|
|
Joined: Oct 2012
Posts: 6,432 Likes: 298
knuckle head
|
knuckle head
Joined: Oct 2012
Posts: 6,432 Likes: 298 |
Took a good look at it, a lot to see there...
61 hot rod A10, 89 Honda 650NT .On a bike you can out run the demons "I don't know what the world may need But a V8 engine is a good start for me Think I'll drive to find a place, to be surly" “
|
|
|
|
Joined: Jan 2014
Posts: 2,173 Likes: 376
Britbike forum member
|
OP
Britbike forum member
Joined: Jan 2014
Posts: 2,173 Likes: 376 |
Sorry about the feet....................
|
1 member likes this:
Stuart Kirk |
|
|
|
Joined: Feb 2008
Posts: 6,076 Likes: 492
Britbike forum member
|
Britbike forum member
Joined: Feb 2008
Posts: 6,076 Likes: 492 |
Yes--you need to wash them more often than every other leap year! (Brit humor).
|
|
|
|
Joined: Feb 2008
Posts: 6,076 Likes: 492
Britbike forum member
|
Britbike forum member
Joined: Feb 2008
Posts: 6,076 Likes: 492 |
P.S. -- sounds really nice. All the Brummie boys would have been proud of you----
|
|
|
|
Joined: Jul 2012
Posts: 462 Likes: 36
Britbike forum member
|
Britbike forum member
Joined: Jul 2012
Posts: 462 Likes: 36 |
Hi Nick
Look forward to a clip when your track testing. Yeah, toolboxes now aday's need to come with a compartment for the laptop.
John
|
|
|
|
Joined: Jan 2014
Posts: 2,173 Likes: 376
Britbike forum member
|
OP
Britbike forum member
Joined: Jan 2014
Posts: 2,173 Likes: 376 |
No worries, i'll get Matt's wife to video it. I may even take it 'round for a few laps myself if my wife lets me.... It's only a club weekend meet so pretty layed back. It's not as if i'm going to try and win is it????
|
1 member likes this:
JER.Hill |
|
|
|
Joined: Nov 2011
Posts: 629 Likes: 105
Britbike forum member
|
Britbike forum member
Joined: Nov 2011
Posts: 629 Likes: 105 |
It's not as if i'm going to try and win is it???? LOL, I'm reminded of when my brother came up to Nova Scotia to take the Kawasaki High Performance Riding School, at the end of which they held a parade of all the participants. My brother "won" the parade by passing everyone including the parade Marshall. The organizers were p*ssed and they bawled ME out as he was riding my race bike (a lowly CB350 Honda)! I was ecstatic and had to bite my tongue not to tell them where to stick their complaints. After all, he'd obviously succeeded at the finer points of "High Performance Riding!" Tom
Life's uncertain - go fast now! Anything worth doing is worth doing well. Steve said that. Anything worth doing well is worth teaching to others. I said that.
|
|
|
|
Joined: Jan 2014
Posts: 2,173 Likes: 376
Britbike forum member
|
OP
Britbike forum member
Joined: Jan 2014
Posts: 2,173 Likes: 376 |
That damn red mist.................................
|
|
|
|
Joined: Jan 2006
Posts: 2,416 Likes: 101
Britbike forum member
|
Britbike forum member
Joined: Jan 2006
Posts: 2,416 Likes: 101 |
Great to see another Brit on the track. Sounds good but def would like to hear it when it's angry! Reminds me of the Moto Giro I rode in. They said it's not a race. Yea....
|
|
|
|
Joined: Feb 2019
Posts: 1,035 Likes: 387
Britbike forum member
|
Britbike forum member
Joined: Feb 2019
Posts: 1,035 Likes: 387 |
Sorry about the feet.................... No apologies needed. I'm always wearing flip flops too. (California thing?)
|
|
|
|
Joined: Jan 2014
Posts: 2,173 Likes: 376
Britbike forum member
|
OP
Britbike forum member
Joined: Jan 2014
Posts: 2,173 Likes: 376 |
Last edited by NickL; 03/14/21 1:03 am.
|
1 member likes this:
JER.Hill |
|
|
|
Joined: Feb 2008
Posts: 6,076 Likes: 492
Britbike forum member
|
Britbike forum member
Joined: Feb 2008
Posts: 6,076 Likes: 492 |
Nice outfit, Nick--- I see the outcome of a lot of experience and the avoidance of a lot of mistakes built into it!
|
|
|
|
Joined: Jan 2014
Posts: 2,173 Likes: 376
Britbike forum member
|
OP
Britbike forum member
Joined: Jan 2014
Posts: 2,173 Likes: 376 |
Thanks Richard, i found these photos on my phone and remembered that Kevin wanted to see a couple. The exhaust/silencer on it at this time would set the noise meters off as it was a very sharp/harsh note so i put the larger exit bottle shape megga type on which is right on the limit but gets through. It, of course meant considerable carbonation changes.
|
|
|
|
Joined: Jun 2013
Posts: 124 Likes: 2
Britbike forum member
|
Britbike forum member
Joined: Jun 2013
Posts: 124 Likes: 2 |
Do you have just the one breather Nick? I have done the timing chest one like yours, and have one in the centre of the rocker cover, which i think will need a deflector/ guard over it inside the cover, as im getting a fair amount of oil in the catch tank for not many miles, although i doubt the rings are bedded in yet which may contribute. I don't have the timed cam breather in but i have fitted a pipe from the exit into the catch tank for a little extra breathing, also, have you experimented with non-return reed type valves in the breather pipe. Have fond memories of seeing Chris Vincent flying round Mallory on his Bsa outfit, amazing to watch coming down the Elbow with a drift going on.
|
|
|
|
Joined: Jan 2014
Posts: 2,173 Likes: 376
Britbike forum member
|
OP
Britbike forum member
Joined: Jan 2014
Posts: 2,173 Likes: 376 |
The primary is used as a plenum the timed breather is blocked off. That 3/8 pipe is the only breather, it seems to work fine. Never used a reed on any of my race engines but all breath into the primary so much larger expansion area.
Mallory was a great circuit, better before the silly 'bus-stop'. Had heaps of fun there.
|
1 member likes this:
PEH |
|
|
|
Joined: Feb 2008
Posts: 6,076 Likes: 492
Britbike forum member
|
Britbike forum member
Joined: Feb 2008
Posts: 6,076 Likes: 492 |
Mallory was my local track-- I lived about 15 miles away in Rugby. In my early days used to ride there with friends--the ride there was quite fast but the return ride after being inspired by the racing was pretty hairy. My favorite spot to spectate was on the exit from the hairpin--you could see the bikes coming up to the hairpin and the outfits drifting around the hairpin before drifting into the Elbow. Worst sight was when I was spectating from the entrance to the hairpin--Fritz Scheidegger had brake problems and didn't slow down or take the hairpin--went straight on, hit the top wall of the hairpin and was thrown high into the air like a rag doll. Terrible loss as he was a really good rider. Ah well--life goes on!
|
1 member likes this:
NickL |
|
|
|
Joined: Nov 2007
Posts: 255 Likes: 39
Britbike forum member
|
Britbike forum member
Joined: Nov 2007
Posts: 255 Likes: 39 |
Mallory was a great circuit, better before the silly 'bus-stop'. Had heaps of fun there. Absolutely, my favourite circuit (pre bus stop!), a circuit people tended to rush at, rather than understand and work with and get rewarded. Nice outfit (even for a BSA  - only joking), seriously was nearly a tickover......... What and when did you race in UK?
|
|
|
|
Joined: Jan 2014
Posts: 2,173 Likes: 376
Britbike forum member
|
OP
Britbike forum member
Joined: Jan 2014
Posts: 2,173 Likes: 376 |
'75-76 morgo triumph then 90-99 bsa powered always the same old outfit bought in 74. Came here in 99 ran for another couple of years with the beezer. Sold it a couple of years ago now, shoulders and back are a bit knackered. https://imgur.com/ywX7KITI still preferred Cadwell Park but only raced on the large circuit once, most of the club and crmc stuff ran on the shortened variant.
|
|
|
|
Joined: Apr 2005
Posts: 3,078 Likes: 135
Britbike forum member
|
Britbike forum member
Joined: Apr 2005
Posts: 3,078 Likes: 135 |
Do you have to wait till the club day to test it Nick?
What is it balanced at? Factory tested and found 56% for racing. The Firebird would be 70% and vibes especially in the bars get intrusive at rpm. Though it's smooth up till 4,000 pretty bad by 6,000 or 7,000. Shame the factory never fixed that.
mark
|
|
|
|
Joined: Jan 2014
Posts: 2,173 Likes: 376
Britbike forum member
|
OP
Britbike forum member
Joined: Jan 2014
Posts: 2,173 Likes: 376 |
G'day Mark We'll runit up again and pull the head down , do tappets etc before the meeting but we don't really have anywhere to test it and i don't like just running it for long as it needs the rings bedding in.
I took a flyer at 60% and it seems to be quite good, Matt doesn't think it's any worse than the 650 he had before. His passenger thinks it's smoother. You have to consider the fact that most races are so short now the blokes can stand a few vibes. You don't get many 8-10 lap heats with 15 lap finals anymore. In the historic series many of the bikes and a lot of the riders couldn't do it.
|
|
|
|
Joined: Apr 2005
Posts: 3,078 Likes: 135
Britbike forum member
|
Britbike forum member
Joined: Apr 2005
Posts: 3,078 Likes: 135 |
Yea, factory said between 55% and 60% made them smoother around 6,000. Bit rougher down low. So after all their work, production stayed 70%. They did all this in the 1950s as well.
It's funny the effort they went confirm what they already knew. Even to drawing and casting OHC heads knowing they could not produce more power, nor be as reliable. When they could have been addressing real improvements worth introducing. Chasing OHC catch up tech, rather than bullet proofing, actual smoothness, discs, 5speeds and hp which would have placed them ahead.
The Firebird has a very sharp sound and a fierceness on full noise that's not normal. I think the clutch is finally just about coping. I cut half the linings off so they are narrower. Having trouble getting the nice valves now because of virus.
I wonder how the factory would have done a 90, still using a bolt on flywheel perhaps?
I have one mostly done just needs counterweights on the flywheel, grinding and rods and balancing and have a 473cam to suit. Reading about the factory just makes me want to try stuff and see what might have been possible.
We had a 90degree 650, big pipes big valves and 38mm TMs it had very good top end, and went from about 5,000-9,000 like a switch when you got to 5,000. It would work at low rpm but not like the 34mm head which is more like having the cake and eating it.
I hope this cam has the outfit going as well as before, or better.
Last edited by Mark Parker; 03/21/21 6:51 am.
mark
|
|
|
|
Joined: Jun 2013
Posts: 124 Likes: 2
Britbike forum member
|
Britbike forum member
Joined: Jun 2013
Posts: 124 Likes: 2 |
Yep was there Trident Man, standing where the Bus stop is now, I heard the bang then saw Fritz and John Robinson go over the top of the crowd on a built up embankment, Robinson survived, but broke just about every bone he had, The picture is still in my head. I lived 4 miles away at the time, when the wind was in the right direction we could here the engines, it had a certain draw to it, my brother and i would cycle down a Drovers track just following the noise, the chap on the gate would let us in as we didn't have a penny to our names, saw Ago on the MV's, Hailwood on the Four's and Six's, awesome sound.
|
|
|
|
|