Topic: Vintage sidecar rebuild - new video

[bear]

Yep.......that's it.

Cheers,
Brian

[Tintop]

Questions Brian....the bike with the camera is a P4, what chassis?  The white & blue in front of it is rear exit.  Is it a P5??  Any info on it, and the others in front of it.  Looks like the P4 finished 5th (1st in class?)  Do the P1/2/3's race with the P4's & 5's??

[bear]

Questions Brian....the bike with the camera is a P4, what chassis?  The white & blue in front of it is rear exit.  Is it a P5??  Any info on it, and the others in front of it.  Looks like the P4 finished 5th (1st in class?)  Do the P1/2/3's race with the P4's & 5's??

Your an observant critter Brian.
The camera bike was built in the early seventies by bloke called Lindsay Erquhart.
Lindsay is in his seventies now but only stopped riding a couple of years ago.

Tim uses 836 motors and they put out a genuine 110+rwhp (correction, 100rwp) and he runs them up to 13500rpm.
There is very little difference in top end bike speed between our bikes around fast tracks like PI.
I tend to have the edge around the tighter tracks because my motors put out significantly more hp and torque lower in the rev range.

There is a speed camera positiond at the start/finish line under the overpass on the main straight.
Tim and I usually clock around the 200kph mark.

The bike in front of Tim was a P5 and like most fast P5's down here it runs an air cooled GSX1100 motor.

Your right Tim and Bryan finished first in class and also won the event.

PI run P3, 4 and 5 together for the "Classic".

Cheers,
Brian

[Tintop]

Thanks for the info Brian.  When you say Tim won his class and the event I'm guessing that means that there are seperate class points per position, and the total from 3(?) races determines the class & overall event winner.

So if my bike was there I could run in the P1..P3 race(s), and yours in the P4/5 races?  As for being observant, wait till I start asking questions about the track.

[bear]

Thanks for the info Brian.  When you say Tim won his class and the event I'm guessing that means that there are seperate class points per position, and the total from 3(?) races determines the class & overall event winner.


So if my bike was there I could run in the P1..P3 race(s), and yours in the P4/5 races?  As for being observant, wait till I start asking questions about the track.

PI run P3, 4 and 5 together but points are allocated separately for each class.
So in effect,  although all three classes race together their points are allocated separately.
Basically three races in one.

I think they would stick you into the P4's with us mate.
P3 is for pre 1969 bikes no neeler frames.
So you'd have to line up with the big boys.

Cheers,
Brian

[Tintop]

Hummm.....it's the Historic Motorcycle Racing Association rules you run under correct (chapter 16)??  Have to check them through again. 

Going to look for a PI track map to compare to the video (motivational research ).  The down hill right looks interesting, sort of like T5a @ Mosport.  Also the double apex left.

[Tintop]

The engine rebuild is in progress.  That's the only thing I'm working on for next season, as the chassis is now handling great.   Have a ported head coming after Christmas.  Guides have been shortened to allow clearance for a Megacycle 250-40 cam (.480 lift).  Will also be installing new springs with Ti retainers, and hardfaced rockers.  My Weber manifold has been re-port matched to the new head.  Also working on a new clutch actuator mechanism.

Saw this on an XS that races with the club, and borrowed it to make my own version.


Couldn't find anyone in the area who has CMM equipment, so had to use my cover and a gasket to ruff it out.  This is the 1st test piece.  Made some adjustments to the CAD, and will get another cut after New Year.  The final parts will be from 3/8 alloy.  The next one will also have a socket hole added, so sprocket changes can be done without removing anything.  There will also be bushings added (larger holes in final pieces) to support the shifter shaft, and clutch rod.


Will also need to make a cover for the alt, something like Joe's 550/750 points covers.

[bear]

The engine rebuild is in progress.  That's the only thing I'm working on for next season, as the chassis is now handling great.   Have a ported head coming after Christmas.  Guides have been shortened to allow clearance for a Megacycle 250-40 cam (.480 lift).  Will also be installing new springs with Ti retainers, and hardfaced rockers.  My Weber manifold has been re-port matched to the new head.  Also working on a new clutch actuator mechanism.

Saw this on an XS that races with the club, and borrowed it to make my own version.


Couldn't find anyone in the area who has CMM equipment, so had to use my cover and a gasket to ruff it out.  This is the 1st test piece.  Made some adjustments to the CAD, and will get another cut after New Year.  The final parts will be from 3/8 alloy.  The next one will also have a socket hole added, so sprocket changes can be done without removing anything.  There will also be bushings added (larger holes in final pieces) to support the shifter shaft, and clutch rod.


Will also need to make a cover for the alt, something like Joe's 550/750 points covers.

Sounds like you are going to have a very competitive bike under  you for next season .

Cheers,
Brian

[Tintop]

Only one thing I haven't told my passenger Brian....if anything breaks the season's over.  Once the engine is built all the pennies go into the PI fund.   Watching the video(s), questions coming shortly re which gear?  I can visualize the track.  The right kink they call T8, is that flat on your bike?

[bear]

Only one thing I haven't told my passenger Brian....if anything breaks the season's over.  Once the engine is built all the pennies go into the PI fund.

Good news!
We will make shore you've got a good bike under you.
If it's unlikely Hooper will be coming down do I line up Newmo?


[quote author=Tintop link=topic=102875.msg1485308#msg1485308 date=138749406
 Watching the video(s), questions coming shortly re which gear?  I can visualize the track.  The right kink they call T8, is that flat on your bike?


[/quote]

T8 is flat out on our bike but it is definitely sphincter puckering.
The bike gets very light
The other fast right , T1 is a half thottle roll off for a second to help you turn it in, then flat again before you hit the braking area for T2.
If you don't the bike will understeer badly and things can get a bit ugly.
You will be hitting 200kph + before you turn in.

It may take you a little while to work into them.

Cheers,
Brian

[Tintop]

Haven't heard one way or the other from Hopper, should have a better idea in the new year.

So here's how I figure the gears go....
T1 - 5th, soft throttle, late apex
T2 - 3rd, double apex, on throttle by the 2nd marshal stand, into 4th at or just after crest.
T3 - 4th, slight roll off on entry, normal apex
T4 - 2nd, late apex
T5 - no relevant, just a kink, but already into 3rd
T6 - 3rd on entry, up into 4th on exit
T7 - into 5th, chair kissing the curb at the end of the rumbles
T8 - 5th flat, slightly late apex.  You don't want to be early.
T9 - 4th, normal to slightly late apex
T10 - 2nd, late apex from left if your alone, otherwise normal apex from mid track to protect inside.
T11 - 3rd normal apex, and into 4th after exit
T12 - in 4th, and into 5th by about mid grid on the front straight

Braking points , T2 / T4 / T9 / T10.  The rest throttle & gear box from what the video seems to show.

[bwaller]

Memorizing corner direction, increasing/decreasing radius etc. to have a picture in your mind is good. Don't overthink the ride though Tin, it'll "unfold" in front of you when you're in the zone.

This is on your bucket list?

[Tintop]

Actually going to see the IoM was at the top, but not any more.   This comes under that heading 'once in a life time'.

Not trying to 'memorize' Brent, just get a feel for the flow, and the 'what's over that hill?' part.  Makes it much easier to find the
'zone'.  Like Mosport is for me today.

[bear]

Memorizing corner direction, increasing/decreasing radius etc. to have a picture in your mind is good. Don't overthink the ride though Tin, it'll "unfold" in front of you when you're in the zone.

Good advice Brent.

Cheers,
Brian

[bwaller]

I think these GoPro cameras help get a racer up to speed more quickly. At least on a new track you can memorize some things before hand. It sure as hell doesn't replace practise time, but it sure does help prepare.

Not sure what you think, but personally I find that Mosport can mesmerize a racer into thinking he's riding quickly more than most tracks. As a result lap times don't improve. For me there are three key spots, into & out of T2, over the hill into the shoot and laying of the brakes into 8 at a million mph.  I think I can hold mine WFO over the hill at T4 but haven't been able to...yet.  Riding Tims P1 weapon will help me be faster in those areas. I feel I've done well everywhere else. Some recent chassis improvements will also play a factor hopefully.    I know it's a "different language" riding on three wheels, but riding fast there takes friggin big balls no matter how many wheels!

Good luck with that once in a lifetime PI trip, and study on man. It's a very cool idea and with this forum, you're never far from friends. I'll take baby steps for now. I'd love to finish my season at Barber then Daytona on back to back weekends. We live in hope, huh?

[Tintop]

I know from watching my Mosport video that there where a number of places I can find more speed next time.  Of course having two bars and the ability to use the brake will really help.   T4 is definitely one of them, and certainly the entrance to T8.  Don't think any of the P2's are getting through T5 any faster than I am.  Hopper says he's never been through there any faster.  As for T2, that has always been my favourite corner, but I know I can carry more speed over the crest, and get the bike sliding more.

The entrance to T4 in the Cortina was only 600 rpm less than at the end of the back straight.   I do have a mental block with that turn though.  Watched a Corvette go off there once and basically explode when it hit the outside armco.  They were still finding fiberglass in the woods years later.  Much better now that there is more runoff, and a better sight line down into T5.

Been a basically sh*ty two days of freezing rain here.  Power went out once today, came back on then an hour later a big bang.  Meter head shorted and ended up 15ft away.  5 hours later have power again, and a new meter.

[RAFster122s]

wow, glad you have power again...
Going to be epic year if things stay together...
lifetime adventure...

David

[Tintop]

So I P'd/U another head yesterday for the motor.  Only thing I'm not sure about is the amount the valve guides have been shorten.  Maybe a bit too much.

Comparisons of last years head, and the new one:



Guide comparison - stock & modified ones.  Note the shortened ones no longer run seals:



Intake & exhaust ports.  Guide had been cut back & shaped.



And one for scottly with the Weber manifold   Question - which epoxy should I use yo clean up the manifold joints??

[Tintop]

Haven't posted to the thread lately, as things are kind of stalled waiting for the new clutch actuation stuff.  It gets waterjet cut & machined sometime next week.  Then I can finish going though the bottom end, and start the rebuild.  The stator on the Sparx permanent magnet alternator burned out.  I had used the 22W 3phase, seems it didn't like running at racing rpm's.   It's being replaced with a 10W version which should solve the issues.  Thanks to Michael Morris @ 650 Central I'm getting a replacement stator & new reg/rec for $100 (new $500+).
 
As for the Fiddaman, have finally decided on an engine.  It will be based on a CB750F DOHC (thanks Mike R ).  Not sure what the final displacement will be, as there are rule changes in the works. 

[bear]

As for the Fiddaman, have finally decided on an engine.  It will be based on a CB750F DOHC (thanks Mike R ).  Not sure what the final displacement will be, as there are rule changes in the works. 

Have you sourced the engine yet Brian?

Cheers,
Brian

[Tintop]

Have you sourced the engine yet Brian?

Cheers,
Brian

Mike Rieck has one that he's tired of tripping over.   It's stock, but the price is right, free.    I plan on picking up next month.

Did you figure out what the tranny issue was at PI??

[bear]

We won't get the engine on the bench till Wednesday mate.
It's been 40degC + here since we've got home, so I'm not allowed out of the house till it cools off a bit.
My body's thermostat is stuffed, l don't handle temp. extremes very well these days.

As for the box, I'm pretty shore I've ripped the dogs off third gear and the shrapnel has drop through the box.
It went off like a bomb.
No case damage though, thank God.
I'll do that race report shortly
Started a couple of times but I get pissed off with myself and do somthing else.

Cheers,
Brian

[Tintop]

I'll send some of our weather to help you cool off, we've been lucky to see to top side of -10C.  Now we're in the process of getting another 10cm of snow!  Don't need to hit the gym, just shoveling snow has been a good enough workout.

Understand your frustration with the result at PI, but sounds like you've got a good idea of what happened.  The good was your lap times were coming down nicely, just to bad you didn't get a chance to get sub 2:10.  Certainly looked like that was in the cards.

[Tintop]

I've been working on the new clutch release for the engine.  Still need to make some bushings for the shifter shaft & clutch rod.  Also have to order a cable.  The arm is a test piece, the finished one is tapered down to where the cable clevis attaches.  The big hole is so I can do sprocket changes with out having to remove anything.

[bear]

Looks good mate.