Author Topic: Team Go Dog, Go! Modified Partial Streamliners  (Read 783581 times)

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Offline wobblywalrus

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2175 on: October 29, 2015, 12:17:48 AM »
Dennis, the signs and decor are all decided upon and made by professionals.  A "Save the Salt" sticker on the tail section with the web address is what I need.  Please post the web address and I will try to make up some stickers.

Mike, this morning I woke up with that "lack-of-sleep" headache.  Drinking half a pot of coffee did not help.  There is no way I could stay awake in the office.  There is an emergency culvert replacement I am designing near Astoria.  It is a three or four hour drive north.  We had to visit it today to take pictures and make some measurements, was my sudden tactical decision.  The junior engineer I am teaching went with me.  We took turns driving and I slept when he was at the wheel.  Now I am rested up and like new.  The young engineers learn a lot from us old guys. 

Offline tauruck

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2176 on: October 29, 2015, 01:49:02 AM »
So, I've got you figured???.

When I was a kid I just wanted to hang with the older guys!.

I guess I had some wisdom. :-D :-D :-D :-D

Offline Old Scrambler

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2177 on: October 29, 2015, 09:26:39 AM »
2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2018 AMA Record - 750cc M-CG HONDA CB750 sohc - 136.6 mph
2018 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 143.005 mph
2018 AMA Record - 750cc M-CF HONDA CB750 sohc - 139.85 mph
2018 AMA Record - 750cc MPS-CF HONDA CB750 sohc - 144.2025 mph

Chassis Builder / Tuner: Dave Murre

Offline wobblywalrus

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2178 on: October 31, 2015, 07:25:45 PM »
Greetings from the show. 

Offline Old Scrambler

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2179 on: October 31, 2015, 07:54:15 PM »
The crowd has their eyes on YOUR bike 8-) 8-) 8-)
2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2018 AMA Record - 750cc M-CG HONDA CB750 sohc - 136.6 mph
2018 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 143.005 mph
2018 AMA Record - 750cc M-CF HONDA CB750 sohc - 139.85 mph
2018 AMA Record - 750cc MPS-CF HONDA CB750 sohc - 144.2025 mph

Chassis Builder / Tuner: Dave Murre

Offline wobblywalrus

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2180 on: November 01, 2015, 10:51:36 PM »
The shop made a sign for the bike.  It is in Wales in the picture.  It was a nice show.  Rose went up with me, a bunch of my riding buddies were there, and we looked at all of the new stuff.  There were a lot of old bikes there, too. 

Offline wobblywalrus

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2181 on: November 01, 2015, 10:59:02 PM »
These are two land speed bikes that run at Speedweek.  One is a blown fuel 125cc altered partial streamliner.  An interesting combination.  The other is a blown gas 650cc altered partial streamliner.  Both look like they were developed by people that knew what they were doing and had some experience doing it.

Offline sofadriver

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2182 on: November 01, 2015, 11:02:23 PM »
Kept going over your way but never did run into you.  :?
Mike in Tacoma

"aww, what the hell - let's just do it".............

Bike #833
100cc A/G, A/F and APS/G (in 2019)

Offline wobblywalrus

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2183 on: November 02, 2015, 11:55:11 PM »
Hopefully we will see each other at the NW reunion.

Last year I sent the head in with the header pipe to be flow tested.  The head and pipe would not fit on the flow bench.  A short 2-inch long stub was used to simulate the header pipe.  A stub is shown on the head and it will be in the box that goes down to California for the port work and flow tests.

The intake valves are 2mm larger than standard with larger seat rings.  Guidance on valve shrouding and countermeasures are given in Vizard's porting book.  The brass part is cut at a 38 degree from vertical angle.  This template will be used to detect shrouding and to guide me in removing the offending material.

Removing metal from the combustion chamber will lower the compression ratio.  It is 12 to 1 and the removal might bring it down as far as 11 to 1.  This will lower peak horsepower 1.3 percent according to one of Vizard's charts.  Removing the shrouding and raising the sonic choke threshold will give me more power than I lose with the 1.3 percent loss, is my guess.

Offline wobblywalrus

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2184 on: November 03, 2015, 12:02:09 AM »
An exhaust valve is put into the intake port to help to position the template.  There is some shrouding around a portion of the intake valve perimeter.  It is carefully removed.  The head gasket shows me that I have enough room for this removal.  The engine is bored out from 790cc to 995 cc.  There is plenty of room to make the cut.  I would not have room if this was a 790cc engine.  The cut would go into the head gasket.  The cut is shown.

Offline wobblywalrus

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2185 on: November 03, 2015, 12:13:32 AM »
The first picture shows before the cut and the second is after.  Note that the combustion chamber wall does not shroud the flow path.

One thing I notice is the combustion chamber does not have enough room for bigger inlet valves.  A lot of metal will need to be removed to prevent shrouding.  Also, the inlet valve margins will be very close together - almost touching.  The valves will shroud each other.  These valves are 2mm oversize.  It is a popular modification to install 4mm or 5mm bigger valves.  I am not sure if it is a good idea.




Offline Old Scrambler

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2186 on: November 03, 2015, 08:39:28 AM »
Compression...........you know you need compression :-(    I'd be real cautious about removing anything more than a 'buff' of the edges near the valves............Higher lift cam...........and or more duration........wider lobe angle..........flat-faced valves..........thinner gasket or no base-gasket........retard the cam a few degrees...........making sure your air supply is ample at max rpm...........ALL of that before flow mods :-) :-) :-)
2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2018 AMA Record - 750cc M-CG HONDA CB750 sohc - 136.6 mph
2018 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 143.005 mph
2018 AMA Record - 750cc M-CF HONDA CB750 sohc - 139.85 mph
2018 AMA Record - 750cc MPS-CF HONDA CB750 sohc - 144.2025 mph

Chassis Builder / Tuner: Dave Murre

Offline wobblywalrus

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2187 on: November 04, 2015, 12:44:32 AM »
Dennis, there are flow tests for the head before the deshrouding.  The head will be tested again.  A comparison can be made.  Head flow is related to horsepower by an equation.  We'll see what happens.

A flow bench was made.  The hose on the Susie Sucker was moved over the the exhaust side.  Now the vacuum cleaner blows rather than sucks.  The hose is hooked up to the intake manifold on the head. 

Offline wobblywalrus

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2188 on: November 04, 2015, 01:00:58 AM »
The intake valves are installed and the Suzie Sucker is turned on.  All sorts of leaves, dog hair, etc blows out the hose and out past the valves.  Eventually everything gets cleaned up and the tests begin.

The little piece of yarn held by the needlenose pliers tells the story.  The flow through the shrouded area tends to go up and curl back over the valve head.  The yarn blows up and out and away from the valve after it is deshrouded.

The air flow needs to go out of the intake port and quickly spread across that big and wide piston.  What I am attempting to do is improve the quality of the flow through the valve curtain.  One goal is to get it distributed as evenly as possible the throughout the curtain.  The other goal is too make the flow spread outward after it passes through the curtain. 

Offline Old Scrambler

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Re: Team Go Dog, Go! Modified Partial Streamliners
« Reply #2189 on: November 04, 2015, 09:54:18 AM »
Could you glue the yarn in place..........then attach the jugs and cover the cylinders with plexi-glass to watch the yarn?

Its just me and not an engineering guru.............but I would not give up compression to gain some very small increase in flow for a mili-second event............maybe 66 sparks per second.

Could you add a second spark-plug? Maybe a smaller diameter.
2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2018 AMA Record - 750cc M-CG HONDA CB750 sohc - 136.6 mph
2018 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 143.005 mph
2018 AMA Record - 750cc M-CF HONDA CB750 sohc - 139.85 mph
2018 AMA Record - 750cc MPS-CF HONDA CB750 sohc - 144.2025 mph

Chassis Builder / Tuner: Dave Murre