Topic: CB750 Wet Sump Conversion - Sumpthing

[MRieck]

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.

[Bert Jan]

we didn't have any problems regarding oil pressure in our tests. The stock pump delivers MORE than enough pressure under normal circumstances.

[Tintop]

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.

[spotty]

[/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.
[/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

[Bert Jan]

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

[Bert Jan]

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!

[Scott]

Duck off oil tank.  I could never see the dart board before

[Sam Green Racing]

hahahahahaha.

[Scott]

I finally got around to finishing the Sump Thing conversion and would like to know what exhaust people are using.

[Bert Jan]

On our demo bike we have a 4 into 1 with k7 stamped into it. Not sure if it's OEM or aftermarket.

[spiffy587]

Will an Automatic oil pan fit a K or F engine?

[Medyo Bastos]

No


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[Sam Green Racing]

Well guys, a year on and the Sumpthing seems to be working well.

[754]

 Any other reports on this cool product ? ARE THEY STILL BEING MADE .?

[Sam Green Racing]

Any other reports on this cool product ? ARE THEY STILL BEING MADE .?

Frank, you can ask Rob who has been testing it under race conditions, he goes by the name voxonda on here.
If you get no answer here, I'll contact him through Facebook for you.

Sam.

[HondaMan]

Any other reports on this cool product ? ARE THEY STILL BEING MADE .?

Yes. I just installed one on an uber-custom (every inch polished) CB750K4 engine. It requires you put oil in thru the tappet cover hole(s), so you have to dribble it in (or the shiny engine gets ugly...). Then you have to count the oil, too, as the sight gage (oil window) on the right side goes from full-to-empty when the oil filter gets pumped full, so you have to dribble in some more oil, watch the sight glass, dribble a little more....until it looks full again. It holds less oil overall than the oil tank setup. You must also remove the whole thing to R&R the engine into the frame, so make a protector plate to cover the oil pan's gasket surface enroute, or it might turn into a real bad day after you dent the oil pan surface on the frame.

And, while it has more surface area than the OEM oil pan, the oil does run hotter than with a tank, so use at least 20w50. You could fit one of those oil coolers that use the adapter plate behind the filter, put the cooler up under the triple tree...

[Sam Green Racing]

Thanks Mark.

[simon#42]

Any other reports on this cool product ? ARE THEY STILL BEING MADE .?

Yes. I just installed one on an uber-custom (every inch polished) CB750K4 engine. It requires you put oil in thru the tappet cover hole(s), so you have to dribble it in (or the shiny engine gets ugly...). Then you have to count the oil, too, as the sight gage (oil window) on the right side goes from full-to-empty when the oil filter gets pumped full, so you have to dribble in some more oil, watch the sight glass, dribble a little more....until it looks full again. It holds less oil overall than the oil tank setup. You must also remove the whole thing to R&R the engine into the frame, so make a protector plate to cover the oil pan's gasket surface enroute, or it might turn into a real bad day after you dent the oil pan surface on the frame.

And, while it has more surface area than the OEM oil pan, the oil does run hotter than with a tank, so use at least 20w50. You could fit one of those oil coolers that use the adapter plate behind the filter, put the cooler up under the triple tree...

ah but mark you are missing the point , it does not matter how crap an idea it is ....... people think it looks good

[754]

Mark thanks for the report.  You can pre measure the oil then add.
Custom bike parts , it usually all about looks. Not all must participate..

[Sam Green Racing]

Any other reports on this cool product ? ARE THEY STILL BEING MADE .?

Yes. I just installed one on an uber-custom (every inch polished) CB750K4 engine. It requires you put oil in thru the tappet cover hole(s), so you have to dribble it in (or the shiny engine gets ugly...). Then you have to count the oil, too, as the sight gage (oil window) on the right side goes from full-to-empty when the oil filter gets pumped full, so you have to dribble in some more oil, watch the sight glass, dribble a little more....until it looks full again. It holds less oil overall than the oil tank setup. You must also remove the whole thing to R&R the engine into the frame, so make a protector plate to cover the oil pan's gasket surface enroute, or it might turn into a real bad day after you dent the oil pan surface on the frame.

And, while it has more surface area than the OEM oil pan, the oil does run hotter than with a tank, so use at least 20w50. You could fit one of those oil coolers that use the adapter plate behind the filter, put the cooler up under the triple tree...

ah but mark you are missing the point , it does not matter how crap an idea it is ....... people think it looks good

Hi Simon, hope you are well my friend but why say it is a crap idea. I think the sight glass is a great idea especially for the novice to these bikes.

Sam.

[scottly]

Sam, I believe what Simon is saying in his usual eloquent way is that converting from a dry sump to a wet sump is a down-grade, not an upgrade, and it's only value is cosmetic. I happen to agree..

[754]

Apparently Bimota did not like the Honda system either.,

[simon#42]

hi sam im fine . sorry i haven't been over to see you have been mad busy but will put that right soon !

scottty understands what i meant and did explain it much better , honda made a very good job of the 750 oiling system . the hipster ring or whatever it is called is worse in all respects than the standard oil system , i have no idea why this thread  is in the performance section .

frank , bimota  did like the honda system they just moved the oil tank .

[scottly]

I wonder if any of the wet sump sohcs had the same longevity of the dry sump 750's, which can exceed 100,000 miles without rebuilding?

[HondaMan]

Back in the [early] 1970s there were 3 wet-sump conversions for this engine. Only one of them held as much oil as the dry-sump OEM arrangements (3.5 or more quarts). I can't remember which one that was, but it was famous for weeping oil around the pan gasket, and you had to use 4-2 pipes to clear it. The other 2 held less than 3 quarts total, so I used to sell oil coolers (Lockhart, mostly) to those guys when I could, to add a little oil and try to cool it down some.