Author Topic: 2016 sohc4 road racing reports, open to all road racers. (Read 19872 times)

simon#42 · « **Reply #75 on:** August 18, 2016, 03:52:24 PM »

now thats my idea of a race bike ......... the sort of bike a crash would improve

brent , a bit off subject but here are a few pictures of baker on roys bike . i dont know who took them i just nicked them off the net

https://www.flickr.com/photos/55699178@N03/28215544024/in/photostream/

https://www.flickr.com/photos/55699178@N03/28801338676/in/photostream/

https://www.flickr.com/photos/55699178@N03/28728088732

Retro Rocket · « **Reply #76 on:** August 18, 2016, 05:47:15 PM »

Thats one tidy looking TZ Simon....

bwaller · « **Reply #77 on:** August 18, 2016, 06:05:08 PM »

I always loved the Yamaha Canada paint scheme, nice of Roy to keep it fresh. It's a great looking bike, did everything work when it was supposed to?

Hopefully we'll get Steve to Mosport next year for the 50th. Not that he was riding then, but it will hopefully be a big show.

simon#42 · « **Reply #78 on:** August 19, 2016, 10:32:10 AM »

almost brent ! i had assumed that roy was going to let steve use the 750 that he normally races , but oh no that would be much to easy .
instead he prepared a bike that has not run since 1980 , one affectionately known as the titanic bike as it looked as if it had just been dragged of
the afore mentioned ship . no two tz750s are the same they have all been messed about with one way or another and this was no exception . at
the last minute he discovered that he needed to run an offset front sprocket at the gearbox , which was ok but the tab washer didnt fit .... so
you can guess what happened ! luckily it happened after the first session had been red flagged for a crash . that and a small problem with the master cylinder
leaking slightly was the sum of it . mr baker was not in the slightest bit worried about any of it .

oh and i hope thats not one of my rd400 engines giving you a hard time !

bwaller · « **Reply #79 on:** August 19, 2016, 03:07:07 PM »

oh and i hope thats not one of my rd400 engines giving you a hard time !

Better not be or I'll sick the Brimmer squad on you!

simon#42 · « **Reply #80 on:** August 20, 2016, 09:00:19 AM »

im worried now !

bwaller · « **Reply #81 on:** August 20, 2016, 11:18:07 AM »

Likely not.

Simon I raced an RD350 in 76 and left the sport for some time, but friends told me they were attempting to spin the RD's backwards (a la TZ) to change thrust and enlarge piston ports with TZ reed cages. Did this ever actually happen? Spargo's RD is the fastest I've encountered so it had me wondering what was done. Not sure about that 80HP number, sounds pretty healthy!

simon#42 · « **Reply #82 on:** August 20, 2016, 01:43:27 PM »

hi brent , the rd already spins the same way as a tz and its not something you could change unless you wanted 6 reverse gears [ im sure there is an italian joke there ]
people did reverse the cylinder on the tz to change the side of the thrust . it was ok on the dyno but in the real world the carbs were close to the front wheel and it didnt really work . i am not a big fan of the rd400 , the reed valves limit power to much . i used to use tz750 reed blocks but lately i have been using some kawasaki motocross
ones . i actually get more power from my rd350 engines which are basically just air cooled tz's with a few alterations that im not going to tell you about .
i have never seen anything like 80hp from an rd400 , im sure its not impossible but there would be very little rd left when you had finished . i have never actually seen 80hp from a tz350 although i have heard plenty of people claim it !

scottly · « **Reply #83 on:** August 20, 2016, 06:21:29 PM »

Quote from: simon#42 on August 20, 2016, 01:43:27 PM

i have never seen anything like 80hp from an rd400 , im sure its not impossible but there would be very little rd left when you had finished .

Simon, ever hear of Tom Turner? He claimed to get 90 HP, and was able to do the quarter mile in 9.95 secs @ 134.33 MPH at 2800' elevation.

simon#42 · « **Reply #84 on:** August 21, 2016, 01:33:08 AM »

no ive not come across him scottly , it does not say at the back wheel so i presume they have calculated it back to the crank . still sounds a lot . it is much easier to get power from a drag racer though as you can just work on peak power and dont have to worry about mid range or rideability . it doesnt have to last very long either .
if you had a picture of the reed blocks and carbs i would have a better idea if it was possible .

Bill/BentON Racing · « **Reply #85 on:** August 21, 2016, 05:47:01 AM »

Small world, don't you love it? I'll ask Gary what he remembers, Bill

scottly · « **Reply #86 on:** August 21, 2016, 09:43:11 PM »

I thought you'd get a kick out of seeing the reference to Gary, Billy.

Simon, the Average HP delivered to the ground to accelerate a 435 pound package to 134.33 MPH in 9.95 seconds calculates to about 85 HP. That's average, not peak. From Billy's recent time slips, his heavier bike was producing a similar average HP. Granted, Tom's RD might have only been good for a quarter of a mile before needing a rest, but it was still a quite impressive smoker.

simon#42 · « **Reply #87 on:** August 22, 2016, 11:29:25 AM »

hi scottly the formula i use for that comes out at 85hp at the crank which if you assume a loss of about 15% for the drive train would make it
about 72 at the rear wheel .

scottly · « **Reply #88 on:** August 23, 2016, 07:53:13 PM »

One of the calculators I used claimed to measure crankshaft HP from ET, MPH, and weight, but given those inputs, only the average amount of work being put to the rear wheel over time can be calculated. In Bill's case, with a RWHP dyno test of a peak 108 HP, the calculator showed about 85 average HP over the quarter mile, using a guesstimation of 590 pounds.

simon#42 · « **Reply #89 on:** August 24, 2016, 04:15:16 AM »

i dont think any of these calculators are very accurate , for one thing they assume that the bike is accelerating at the same rate over the quarter mile which it isnt .
thats why they say its an average hp which doesnt mean allot .
the whole power measurement thing is a can of worms , although dynojet dyno's measure power at the back wheel they add a correction factor to allow for losses [ they dont say exactly what losses ] which means its not actual rear wheel hp . engine dyno's dont include the losses from the chain and rear wheel etc etc . the trouble is people love big power numbers and if the customer doesnt get them he or she tends to sulk !
obviously this does not apply to you and your ditch pump scottly.

Haybus · « **Reply #90 on:** August 29, 2016, 10:14:37 AM »

Round 5 at Pacific Raceways, our club's home track. Schedule had an early shut down for drag racing Saturday night. Vintage was supposed to be the last race but they got behind and pushed us to Sunday. Two races on Sunday is our typical format anyways. I was feeling good in practice, turned 6 seconds faster than I had at round 1. Knocked off 2 more seconds in the Sunday morning practice.

Race 1 - I'm on pole because I'm second in points and John isn't there (going to the AHRMA race in Utah). My pit mate Chris gets the hole shot and I follow him around for a couple laps. I have more motor, but he's 60 pounds lighter, so we're fairly even. I got around him on the straight, and he stayed right on me for the next lap, but fell off after that leaving me to score my first ever win. My daughter works track exit and I can hear her on the radio saying something about a part from bike 223. Chris' muffler fell off and he ran it over. Fortunately it didn't destroy his tire or put him on the ground, but it certainly messed with his head a bit. We both shaved off another 2 seconds on our laps times, and he's only half a second slower so game on for the next race.

Race 2 - That light goes out and Chris is gone!! Years of fuel altered drag racing sure pays off. Chris is riding tight lines and I'm right on his tail, until he totally blows the entry to the bus stop on lap 1 and has to ride around it. I get around him and score another win and the overall.

All in all it was a great weekend. My best lap was 10 seconds faster than my best lap at round 1. Had a lot of family and friends at the track who had never seen me race. Glad they waited until this year to watch, ha ha!! I also raced an SV650 but that's hardly worth mentioning. The Saturday night drags were so awesome. There was a top fuel Harley that did over 200 mph. Tons of 60's and 70's cars. Seemed like they were getting 2-3 drag races every minute. Super fun to watch.

Alan

bwaller · « **Reply #91 on:** August 29, 2016, 11:13:30 AM »

Awesome Alan. Nice riding.

turboguzzi · « **Reply #92 on:** August 30, 2016, 03:22:10 PM »

congrats indeed!

Haybus · « **Reply #93 on:** September 13, 2016, 07:21:05 PM »

Awful quiet on the road racing front. Jonesin' for something to read.

Alan

bwaller · « **Reply #94 on:** September 14, 2016, 05:37:12 AM »

Nothing positive from me unfortunately. We had our final round at Calabogie last weekend at a new (to VRRA) facility. Big track, fairly new, awesome surface, not a bump or crack offering excellent traction. This place was built for cars so there are spots that need temporary protection installed to keep riders safe.

I've never been there so signed up for practice both Thursday & Friday. Thursday morning was very wet and the pace was slow as people tried to learn these 20 odd corners, six of which are blind and several are decreasing radius. This to say the designer is a bloody masocist.

I was increasingly impatient in the morning following others around, not getting a good feeling for the layout. After lunch the track was drying and I made some passes to get open track ahead to "see" better. Mistake number one! The best way to learn a new track is to continue picking braking spots, turn in points, apexes. The left corner, right corner business, blind or otherwise will automatically "sink in". Well I wicked it up too soon and entered a tricky spot too hot, had to stand it up, went off track and lowsided in the wet grass. The bike suffered very little damage but I broke five ribs.

Practice crash, unable to ride, blew the championship, fukin idiot, Sure if I was twenty years younger I would have "numbed" the pain & ridden, but it hurt & I didn't. Maybe it's time to hang em up.

Old Scrambler · « **Reply #95 on:** September 14, 2016, 07:52:17 AM »

Pain is tough to take at OUR age............and we tend to heal slower

But I know the feeling of open space and riding fast

........that's why I like the salt. If I stay within 15-miles of the post speed-limits, I can handle the corners on our local roads.........OK........sometimes 20 or so over

To bad about the points............Next Year

turboguzzi · « **Reply #96 on:** September 14, 2016, 10:20:07 AM »

hope you are feeling better brent....
on a positive note, sohcs did well in the last italian round, marco leardini winning the 750 class with his big bore 650, beating an ex-pro on an super quick F1 duc by a few tenths at the line. Riccardo is making giant steps with his CB750, taking a fourth and lapping at super respectable times, beating another fast 750 pantah. he slashed off some 6 seconds from his lap times at magione last year!

slikwilli420 · « **Reply #97 on:** September 14, 2016, 10:33:31 AM »

Quote from: turboguzzi on September 14, 2016, 10:20:07 AM

hope you are feeling better brent....
on a positive note, sohcs did well in the last italian round, marco leardini winning the 750 class with his big bore 650, beating an ex-pro on an super quick F1 duc by a few tenths at the line. Riccardo is making giant steps with his CB750, taking a fourth and lapping at super respectable times, beating another fast 750 pantah. he slashed off some 6 seconds from his lap times at magione last year!

Any pics/ info/ specs on the bikes mentioned? Anything I can do to get an edge with my AHRMA racer I will take with open arms.

turboguzzi · « **Reply #98 on:** September 14, 2016, 02:54:36 PM »

marco's father built the bike and he's a bit tight lipped about what he did there, he's right on the limit of 750c.c. on that 650 based motor, amazingly runs on punny CB750 28mm carbs and it's still a flier. stock frame but magnesium wheels, square section s'arm and a marzocchi fork

http://forums.sohc4.net/index.php?action=dlattach;topic=149461.0;attach=298255
http://forums.sohc4.net/index.php?action=dlattach;topic=149461.0;attach=298259

riccardo's (livefast_dieold) is a very lightened up CB750, he pops on here every now and then, am sure he will answer your questions

http://forums.sohc4.net/index.php?action=dlattach;topic=149461.0;attach=298261

Haybus · « **Reply #99 on:** September 14, 2016, 06:23:34 PM »

I'm sorry to hear that Brent, glad it wasn't worse. No shame in not riding with broken ribs. Our final round is this weekend and our weather is looking the same as what you had. Not super excited for a wet weekend.

Alan

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Author Topic: 2016 sohc4 road racing reports, open to all road racers. (Read 19872 times)