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Author Topic: CB750 Wet Sump Conversion - Sumpthing  (Read 73762 times)

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Offline gschuld

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #150 on: March 06, 2018, 09:23:36 AM »
For a rough visual, it’s roughly 8 pounds for oil tank/Sumpthing and oil.  Weight goes from the triangle to under the engine.  Not a massive shift in weight, but not insignificant either.

George
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Offline dragracer

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #151 on: March 06, 2018, 10:21:47 AM »
You'd be surprised how much difference it makes in moving that weight down low, and forward as far as drag racing is concerned.  Again, ground clearance would be my only concern.
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Offline gschuld

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #152 on: March 06, 2018, 12:17:19 PM »
The Sumpthing will be at the same level as the bottom of the kickstand bracket and be about 1/2” higher up than the bottom of the collector on your V&H sidewinder pipe.

George
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Offline voxonda

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #153 on: March 06, 2018, 12:33:41 PM »
Major set back......primary chains are out of spec. Damn......
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Offline Bert Jan

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #154 on: March 06, 2018, 01:39:08 PM »
Quote from: voxonda on March 06, 2018, 12:33:41 PM
Major set back......primary chains are out of spec. Damn......

Ah #$%*.. You know what to do then...

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Offline scottly

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #155 on: March 06, 2018, 07:10:09 PM »
Quote from: voxonda on March 06, 2018, 05:40:42 AM
Quote from: Tintop on March 06, 2018, 04:46:04 AM
It will be interesting to see how moving the weight of the oil & tank, and putting it under the engine changes the centre of gravity, and if that requires slight suspension setting changes.  Should put slightly more weight on the front end.  Following with interest Rob.

Hey Brian, thanks for your interest. Shifting weight up front and down low will change the C of G just very slightly and I do not expect to have to change my setup. Need to build new pipe because of the low sump, so maybe even have to raise the whole bike a little bit..........

Cheers Rob
If you raise the whole bike a little bit, it will more than offset the shift in C of G from removing the oil tank. ;)
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Offline gschuld

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #156 on: March 06, 2018, 07:21:10 PM »
Quote from: voxonda on March 06, 2018, 12:33:41 PM
Major set back......primary chains are out of spec. Damn......

PM sent Rob

George
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Offline voxonda

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #157 on: March 07, 2018, 10:48:47 AM »
Well, despite the setback and thanks to the help I received, and a day away, we are back in the game. Time is ticking for the new season and a lot needs to be done still. Parts for the pump are coming in tomorrow. Bolts for the sump arrived today, so can pre-assemble tomorrow to check out dimensions for the new exhaust to be build. After that the engine comes out and will be rebuild.............to be continued.
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Offline Bert Jan

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #158 on: March 07, 2018, 01:42:40 PM »
Quote from: voxonda on March 07, 2018, 10:48:47 AM
Well, despite the setback and thanks to the help I received, and a day away, we are back in the game. Time is ticking for the new season and a lot needs to be done still. Parts for the pump are coming in tomorrow. Bolts for the sump arrived today, so can pre-assemble tomorrow to check out dimensions for the new exhaust to be build. After that the engine comes out and will be rebuild.............to be continued.

You're quite the busy fellow then!

Just to clearify this, the normal kit (the one we sell) is a complete kit with bolts and everything in it. I gave Rob a final prototype to fiddle around with so that's why he had no hardware ;)
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Offline voxonda

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #159 on: March 07, 2018, 02:24:34 PM »
No problem, BJ. Got a stack of bolts in, so let the fight begin. Almost everything on hand now to pre-assemble.
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Offline voxonda

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #160 on: March 08, 2018, 01:10:12 AM »
So this morning came around to mount the wet sump and both blockingplates. Now can work on the exhaust.
Think it looks great so far.
BIG thanks to George for having me buy his HD primary and camchains, very grateful to him.
« Last Edit: March 08, 2018, 01:13:11 AM by voxonda »
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Offline gschuld

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #161 on: March 08, 2018, 04:39:19 AM »
Looking good Rob.👍

Give those new chains a workout!  They will be on their way in 3 hours.

George
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Offline voxonda

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #162 on: March 08, 2018, 06:32:54 AM »
Working on the oilcooler setup. Not happy with the cooler in the pressure side, so making some plumbing to fit into the return.

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Offline gschuld

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #163 on: March 08, 2018, 07:41:34 AM »
New chains are on the way Rob.

George
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Offline slikwilli420

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #164 on: March 08, 2018, 07:41:54 AM »
Quote from: voxonda on March 08, 2018, 06:32:54 AM
Working on the oilcooler setup. Not happy with the cooler in the pressure side, so making some plumbing to fit into the return.

Looking good. Side note, I really like how you couterbored the clutch cover to sink in the socket screws, looks factory. If you weren't familiar with these engines, you would think it came that way. I might have to steal the idea.
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Offline voxonda

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #165 on: March 08, 2018, 09:01:03 AM »
Quote from: gschuld on March 08, 2018, 07:41:34 AM
New chains are on the way Rob.

George

Thanks sooo much, G.
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Offline voxonda

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #166 on: March 08, 2018, 09:04:33 AM »
Quote from: slikwilli420 on March 08, 2018, 07:41:54 AM
Quote from: voxonda on March 08, 2018, 06:32:54 AM
Working on the oilcooler setup. Not happy with the cooler in the pressure side, so making some plumbing to fit into the return.

Looking good. Side note, I really like how you couterbored the clutch cover to sink in the socket screws, looks factory. If you weren't familiar with these engines, you would think it came that way. I might have to steal the idea.

Of course you are welcome to that. Also did the, new to mount, valvecover and the covers on otherside of engine.
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Offline slikwilli420

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #167 on: March 08, 2018, 09:26:52 AM »
Quote from: voxonda on March 08, 2018, 09:04:33 AM
Quote from: slikwilli420 on March 08, 2018, 07:41:54 AM
Quote from: voxonda on March 08, 2018, 06:32:54 AM
Working on the oilcooler setup. Not happy with the cooler in the pressure side, so making some plumbing to fit into the return.

Looking good. Side note, I really like how you couterbored the clutch cover to sink in the socket screws, looks factory. If you weren't familiar with these engines, you would think it came that way. I might have to steal the idea.

Of course you are welcome to that. Also did the, new to mount, valvecover and the covers on otherside of engine.

Very cool. Not to derail this conversation, but could you post a few pics please??
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Vintage Speed Parts Mashup: http://forums.sohc4.net/index.php?topic=133638.0
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AHRMA CB750 Racer: http://forums.sohc4.net/index.php/topic,158461.0.html
AHRMA Superbike Heavyweight Racer: http://forums.sohc4.net/index.php/topic,173120.0.html
'76F CB750 Patina Redemption: http://forums.sohc4.net/index.php/topic,174871.0.html

Offline voxonda

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #168 on: March 09, 2018, 02:21:34 AM »

Only one from awhile ago, unblasted and unsprayed.


« Last Edit: March 09, 2018, 04:52:24 AM by voxonda »
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Offline gschuld

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #169 on: March 09, 2018, 04:01:05 AM »
Rob,

What is the purpose of the two extra mount locations?  Is it for attaching some sort of cam cover to upper frame mount?   They don't appear to be  in the right locations for cam tower support(plus you'd need 4 per side)

George
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Offline voxonda

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #170 on: March 09, 2018, 04:57:12 AM »
Quote from: gschuld on March 09, 2018, 04:01:05 AM
Rob,

What is the purpose of the two extra mount locations?  Is it for attaching some sort of cam cover to upper frame mount?   They don't appear to be  in the right locations for cam tower support(plus you'd need 4 per side)

George

Hi George,

Something I did on my DOHC racer, thanks to Brent Hyde aka Captain here. Use a small (-3)line to de-air the oiling system at the top of oilfilter and use that to, extra, oil the cam bearings and or camchain by spraying through a nozzle.
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Offline slikwilli420

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #171 on: March 09, 2018, 06:19:10 AM »
Quote from: voxonda on March 09, 2018, 04:57:12 AM
Quote from: gschuld on March 09, 2018, 04:01:05 AM
Rob,

What is the purpose of the two extra mount locations?  Is it for attaching some sort of cam cover to upper frame mount?   They don't appear to be  in the right locations for cam tower support(plus you'd need 4 per side)

George

Hi George,

Something I did on my DOHC racer, thanks to Brent Hyde aka Captain here. Use a small (-3)line to de-air the oiling system at the top of oilfilter and use that to, extra, oil the cam bearings and or camchain by spraying through a nozzle.

You are full of neat little tricks. Would love to see some pictures of that setup as well. Did you find it controlled wear on internals any better than without it?
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All you gotta do is do what you gotta do.

Vintage Speed Parts Mashup: http://forums.sohc4.net/index.php?topic=133638.0
Rickman CR Parts Kit Refresh: http://forums.sohc4.net/index.php/topic,154837.0.html
AHRMA CB750 Racer: http://forums.sohc4.net/index.php/topic,158461.0.html
AHRMA Superbike Heavyweight Racer: http://forums.sohc4.net/index.php/topic,173120.0.html
'76F CB750 Patina Redemption: http://forums.sohc4.net/index.php/topic,174871.0.html

Offline gschuld

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #172 on: March 09, 2018, 08:56:00 AM »
Quote from: slikwilli420 on March 09, 2018, 06:19:10 AM
Quote from: voxonda on March 09, 2018, 04:57:12 AM
Quote from: gschuld on March 09, 2018, 04:01:05 AM
Rob,

What is the purpose of the two extra mount locations?  Is it for attaching some sort of cam cover to upper frame mount?   They don't appear to be  in the right locations for cam tower support(plus you'd need 4 per side)

George

Hi George,

Something I did on my DOHC racer, thanks to Brent Hyde aka Captain here. Use a small (-3)line to de-air the oiling system at the top of oilfilter and use that to, extra, oil the cam bearings and or camchain by spraying through a nozzle.

You are full of neat little tricks. Would love to see some pictures of that setup as well. Did you find it controlled wear on internals any better than without it?

Very interesting.🤔.  You smart fellas are keeping me entertained for sure👍.

George
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Offline voxonda

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #173 on: March 10, 2018, 09:30:34 AM »
Happy with outcome of today, new routing of oillines to work with the wet sump. Tests are first without cooler and depending on outcome will choose what cooler size to use.
« Last Edit: March 10, 2018, 10:03:17 AM by voxonda »
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Offline gschuld

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #174 on: March 10, 2018, 10:20:49 AM »
Oh that’s interesting.  I had originally assumed the factory oil tank line ports needed to be shut off leaving oil cooler plumbing options at the oil filter only.  Great. ;)

George
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