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Author Topic: CB750 Wet Sump Conversion - Sumpthing  (Read 11369 times)

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Offline MRieck

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #300 on: June 17, 2018, 08:49:36 am »
compliments rob, specially for putting your money where your mouth is!
cant recall if you have a pressure gauge... no drops in strong acceleration/braking?
what's the "gas cap" in the tail for?

Due to time pressure not been able to fully concentrate on when or if it drops, but it is looking good. Gas cap on tail is is oil fill cap.

Can't see it dropping under acceleration, as the oil is being held against the pick-up; possibly under braking, but then the entire sump contents would have to migrate up into the engine, not good, but easily solved with a windage tray.  A simple oil warning light would answer the question.
A lot of Yamaha's use the oil level warning light. On a slight incline highway onramp I can get the light to stay on through 3rd gear under hard acceleration. Used to scare the cr@p out of me so I installed a pressure gauge. ;D
Owner of the "Million Dollar CB"

Offline Bert Jan

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #301 on: June 19, 2018, 02:59:29 pm »
we didn't have any problems regarding oil pressure in our tests. The stock pump delivers MORE than enough pressure under normal circumstances.

Offline Tintop

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #302 on: June 19, 2018, 06:06:41 pm »
we didn't have any problems regarding oil pressure in our tests. The stock pump delivers MORE than enough pressure under normal circumstances.

After Rob's little 'road test' Bert Jan I have no doubt that it is bullet proof on the street, and it would appear likely in a racing application.  The light smoke in the photos I saw, was only banked over in a corner.  Could easily be oil being sucked down the exhaust valve guides on the over-run on corner entrance.
1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
Sidecar Rebuild Thread

Offline spotty

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #303 on: June 19, 2018, 07:24:23 pm »

[/quote] A lot of Yamaha's use the oil level warning light. On a slight incline highway onramp I can get the light to stay on through 3rd gear under hard acceleration. Used to scare the cr@p out of me so I installed a pressure gauge. ;D
[/quote]

a certain yamaha which shall be called a bloody vmax from here on is well known for its propensity for accelerating at previously unknown rates ( at the time anyway ) which leads the oil to shift suddenly towards the back of the engine...yamaha in their wisdom ( or bent sense of humour ) saw fit to install the oil level sensor at the front of the motor......this causes the oil light to come on just when you'd rather it didn't

the oil pickup is at the back so theres no real problem but it sure does scare the crap out of you the first couple of times, after that you just learn to ignore it
and here was me thinking I'd kicked the honda habit........silly me

Offline Bert Jan

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #304 on: June 21, 2018, 03:07:50 pm »
we didn't have any problems regarding oil pressure in our tests. The stock pump delivers MORE than enough pressure under normal circumstances.

After Rob's little 'road test' Bert Jan I have no doubt that it is bullet proof on the street, and it would appear likely in a racing application.  The light smoke in the photos I saw, was only banked over in a corner.  Could easily be oil being sucked down the exhaust valve guides on the over-run on corner entrance.

Thanks for your trust! We've sold a bunch now with no complaints, only praise so i'm really happy it's being picked up so well all around the world. I'm expecting the next batch this next week so I've got the kits in stock then wich will make shipping waaaay faster than the 6 to 8 weeks said on the website ;)

Offline Bert Jan

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #305 on: July 27, 2018, 12:23:17 am »
Hi guys, just a little update this time. All open orders were shipped last week, we have the kits in stock and they are ready to ship.
I guess this thread is going to get less traffic as the kit has proven itself and most questions have been answered here.

If you stumbled on here thru a search engine and/or for future reference, please email any questions to contact@sumpthing.net or outsidersmotorcycles@gmail.com.

It's been a hell of a ride so far so thank you all, in special all the members who bought the kit!

Cheers!

Offline Scott

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #306 on: August 05, 2018, 12:57:46 am »
Duck off oil tank.  I could never see the dart board before

Offline Sam Green Racing

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #307 on: August 05, 2018, 05:26:37 am »
hahahahahaha.
C95 sprint bike.
CB95 hybrid race bike
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Offline Scott

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #308 on: August 25, 2018, 10:16:16 pm »
I finally got around to finishing the Sump Thing conversion and would like to know what exhaust people are using.

Offline Bert Jan

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #309 on: August 26, 2018, 01:06:56 am »
On our demo bike we have a 4 into 1 with k7 stamped into it. Not sure if it's OEM or aftermarket.

Offline spiffy587

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #310 on: September 19, 2018, 03:34:53 pm »
Will an Automatic oil pan fit a K or F engine?

Offline Medyo Bastos

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Re: CB750 Wet Sump Conversion - Sumpthing
« Reply #311 on: September 19, 2018, 03:41:01 pm »
No


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