Pretty much as the title says. Being replacement rubber I wasn't expecting much but I'm pretty surprised it happened after only a year of use. I had to pull my tank to make some modifications. I shook it loose from the bottom and didn't pay much attention to it since it was new. I went to put the tank back in and was shocked at the degradation. I'm not sure buying another from a different vendor would be any better as they probably are all made in the same place. I'm also not sure I want to keep using it. Me no likey gas leaks. My big fear is having it crack at where the hose clamp goes now that I have disturbed it. Also I have an in tank pump so it's not like the tank won't be coming down again.

I wonder if these guys might see an opportunity. They sell the tanks. They should know about the need. Apparently they have a rubber parts supplier.

Check out their 6 speed too. Somebody should tag them.

https://shop.s30.world/rubbers

https://shop.s30.world/fuel-tanks

https://shop.s30.world/product/nismo-32010-rrs50-reinforced-6-speed-transmission-to-l-series-conversion-kit

Somebody should tell them that their gear ratio graphic is messed up.

42 minutes ago, Zed Head said:

Somebody should tell them that their gear ratio graphic is messed up.

It opens OK for me. Maybe your recent browser problems are to blame?

I tried it again and it worked. Who knows...

I wonder how it compares to other kits out there. Looks very interesting. The price seems very reasonable. Sorry to divert your thread Derek.

https://www.instagram.com/reel/Dbp2YSFsiU5/

https://nismoparts.nissanusa.com/parts/nismo-nismo-s15-silvia-reinforced-6sp-transmission-32010rrs50

https://www.godzillaraceworks.com/drivetraintl70/tl70swap

Derek, is S30.World using your bellhousing? I don't see it on your web site anymore. To be frank, no offense, your web site could really use some work. I know the business is a side-project though. Good luck with it.

https://www.classiczcars.com/forums/topic/65204-trannydiff-ratio-and-rpm-speed/page/2/

https://datsunworks.com/

https://datsunworks.com/Blog/

Edited August 19Aug 19 by Zed Head

What happens if you heat the filler neck some with a heat gun? Does it soften up any?

11 hours ago, Zed Head said:

Derek, is S30.World using your bellhousing?

I think you've got your wires somewhat crossed again. The S30.world 'Takumi Series' TS-001 version of the NISMO 32010-RRS50 transmission uses a front case and bellhousing to match the L-series engine which is manufactured in Japan by GIKEN Combination Company (GIKEN CC).

11 hours ago, Zed Head said:

Derek, is S30.World using your bellhousing? I don't see it on your web site anymore. To be frank, no offense, your web site could really use some work. I know the business is a side-project though. Good luck with it.

No they use a different method. 100% agree on my web site. I really do all of my sales of bell housings through Godzilla Raceworks and I let them handle all of that.

10 hours ago, Patcon said:

What happens if you heat the filler neck some with a heat gun? Does it soften up any?

It may soften it up. Honestly it never really fit properly. It's almost like they cut the section that goes on the tank too short. The other issue is I think it may have been leaching fumes into the cabin. I'm using a VTS poly tank and the first time I pulled it down I decided to pressure test it to see if I could find the source of the fumes. It was air tight. If I put my nose up to the filler neck I swear I can smell gas.

I ordered some 2 1/2" ID filler neck hose and 2 1/2" aluminum intercooler pipe and I'm going to see if I can plumb a better solution.

I assume that Datsun Works means Datsunworks. He got mentioned four times. They must be aware. Might be where they got the idea.

"*Have a NISMO DOHC or a Datsun Works DOHC head on your L-series engine? Ask for the custom DOHC bellhousing kit:"

It would be nice to know more about this Takumi company/people/organization. Searching "Takumi" or "Takumi Series" on the internet brings up some odd things. I tried Takumi Motors and found the link below. Can't tell if it's the "most respected engineering and prototyping shop" or not.

https://usa.nissannews.com/en-US/releases/nissan-s-legendary-takumi-four-master-craftsmen-who-hand-build-every-nissan-gt-r-engine

Are these four guys the ones that designed and built it or is "Takumi" a general term? Who is the "shop"? Or is it one guy? They said "his", below.

I do like to know where things come from. Maybe it's a secret.

https://shop.s30.world/product/nismo-32010-rrs50-reinforced-6-speed-transmission-to-l-series-conversion-kit

"Rather than adapting a weld-on bellhousing solution, S30.world partnered with one of Japan’s most respected engineering and prototyping shops that developed an entirely new bellhousing. Every Takumi Series component is developed by this long-standing Japanese engineering partner, whose decades of experience designing high-performance components for Japanese OEMs."

"In Japanese culture, the term “Takumi” refers to a master craftsman. For decades his company has developed prototype components and engineering solutions for Japan’s leading automotive manufacturers."

I didn’t see it in the initial ad but there’s no compatibility for the factory speedometer. GPS would have to be utilized. Godzilla Raceworks has been providing this same transmission for quite awhile with a better breakdown on what’s needed for the conversion.

27 minutes ago, Zed Head said:

I assume that Datsun Works means Datsunworks. He got mentioned four times. They must be aware. Might be where they got the idea.

So Here is my take on conversions and why I approach it the way I do. We take an Aisin TL70 and cut a non critical part (bell housing) off of the transmission. I leverage a factory cover to give me the precision I need to make it all work. We never open the case and none of the machining I do is super critical. On the Escort conversion they weld a new bell housing onto the existing case. I have no idea the process they use but the reality is adding that kind of heat to an already machined piece is asking for trouble. The one from S30 uses a custom casting that has to be machined to the same tolerances as the original. Without knowing Asian's tolerances this can be tricky. I firmly believe this was developed for the Nismo DOHC which is configured as a reverse tilt. I'm sure the thinking was let's make it fit the standard tilt as well.

The TL70 I use utilizes a platform style shifter like the CD009. This allows me to put the shifter just about wherever I need to. This has opened it up to more vehicles. Case in point I've developed a 6 speed conversion for the Triumph TR6 and I'm starting on the MGB.

19 minutes ago, Zed Head said:

I do like to know where things come from. Maybe it's a secret.

Clearly stated on the S30.world web page for the transmission, the Japanese designer and manufacturer of the front case and bellhousing conversion is a company called GIKEN Combination Company ('GIKEN CC'). I also mentioned it in my above answer to your question:

7 hours ago, HS30-H said:

The S30.world 'Takumi Series' TS-001 version of the NISMO 32010-RRS50 transmission uses a front case and bellhousing to match the L-series engine which is manufactured in Japan by GIKEN Combination Company (GIKEN CC).

I rather doubt that - admirable though Derek's work is - either GIKEN CC or S30.world will have got the idea for an L-series conversion kit for the NISMO S15 6-speed from Datsunworks. Nor will other manufacturers of similar products such as ESCORT Japan, who have had their version on the market for at least two and half years already. Conversion cases/bellhousings are hardly a new idea. are they?

I believe the owner of GIKEN CC - as a fellow automotive engineer and machinist - is an admirer of Derek's Datsunworks KN20 cylinder head and that's why he is prepared to make a custom front case/bellhousing for a customer to mate the Datsunworks KN20 with the NISMO S15 6-speed in the same (clocked) way that the NISMO twin cam head conversion can be.

As for your thinking out loud/stream-of-consciousness style musing on the word 'Takumi', I'm somewhat nonplussed at your direction of travel. Clearly (maybe not...?) the word 'Takumi' is simply being used as a catchy name for a particular themed line within S30.world's product range. No idea why you'd want to dissect it any more than that.

Maybe - to stop the universe getting lopsided - there's somebody in Japan wondering why the word 'Craftsman' is written on a wrench...?