i was wondering if any of yall know how this seven can run its water pump backwards.here is the link rx7 and if u scroll about half way down it has a pic of the engine. i would realy likt to run my belt like this so u can keep my power pullies on, because ring now my belt bearly touches my water pump. so if u know anything about this could u please tell me thanks


eric

 

I'm pretty sure the pump only works one way. I think that guy in superstreet may have overheating problems.

That makes me believe it even more.

 

that was the same thing i was think i just was wondering b/c it would make me feel safer if i had alot more belt on my pully

 

The water pump cannot be run backwards.

If you had the time and money you could cnc machine a custom impeller and replace the stock impeller so that it would flow the right direction when spun in the opposite direction.

Or, you could just leave it alone.

As an aside, that car has so much rice I don't think I can sushi for a month. WTF is up with the nitrous bottles mounted up on the cage? That violates every regulation I can think of. Let's just have pressurized nitrous bottles come flying at the driver in the event of an accident. Not to mention the gratuitous wing.

 

Ha ha... I met that guy last month on the Super Street Tour but he wasn't driving his 7.

edit: He said the turbo he has made about 920 rwhp, but it made those numbers in another car.

 

Yeah, you're gonna have bigtime problems running it like that! Dumbass.

Anyhow, I thought with the right belt size that belt slipping wasn't a problem w/ no air pump and pullies.

Dale

 

Actually that's the only way you can have a nitrous bottle mounted according to NHRA rules (but probably not that high up), on the roll cage.

 

I wasn't aware of a requirement to mount them on the cage. AFAIK, they only have to be securely and permanently mounted:

IMHO, no tech inspector in their right mind would allow something like that to pass.

 

How much money did they waste on carbon fiber? And where the hell are the splash guards in the engine bay? Where's the air filter on the turbo inlet?

P.O.S if you ask me. And the gimp doing the crane thing... I'd love to show him a tornado kick.

 

Well, in cars with full roll cages, there is nothing to mount it to but the roll cage. Screwing it to the "floor" is probably more dangerous than securing to the roll cage. Screws will rip out in a crash.

 

all you have to do is get a slightly longer belt and tilt the alternator more to the side. you could also make your own alternator bracket to make it adjust more to the passenger side. trying to run the pump backwards is just going to earn you a new motor

 

I don't think that's carbon fiber - that's that carbon-fiber-vinyl-lookalike crap.

 

No it actually says it's all CF... unless they are telling a tale.

 

There are a few people on the forum that I've seen run thier water pump backwards and said they didnt have any problems with it.

You could always try it out and if it starts to get hot just shut down and switch it back. I wouldnt really romp on it though till you know for sure its working right. One guy told me he had his belt on backwards for over a year with no problems.

I officially recommend you as the forum guinee pig for this test!!! Try it out and report back, just think its possible you could go down in history as the guy that officially decided it was ok (or not ok lol ) to run your water pump backwards

Stephen

 

I hope you don't mean me... I'm having enough problems as it is

 

wait, dont the FC pumps, pump in the other direction? i know the 20b ones do.... i dont know if that means you can spin the belt pulley backwards though.... i think they all rotate in the same direction... just that the flow i believe is reversed on the older ones? (dont quote me on that though) -heath

 

haha, nah I meant one of the guys that was wondering about this. Of course your engine isnt in all that good of health anyway so if you burned it up it wouldnt be THAT much of a loss....hmmmmm


hahahaha

 

FC water pumps (and all other rotary pumps that I know of) all spin backwards compared to the FD.

Could you use an FC impeller section with the FD water pump body?

*edit* judging by the fact that the gasket from the impeller section to the pump body is quite a different shape from FD to FC, I would guess that if you can't just swap the impellers.

Anyone ever put the FC body + impeller on the FD engine?

 

get an electric pump.

the fd pump is one way, reverse rotation would reduce flow. a bit like running a compressor wheel backwards.

... OK for a show car ...

https://www.rx7club.com//attachment....postid=2320275

 

I looked at it and it didnt look like it would be easy to do and it seems like the sizing was off or something. Maybe I'll go back out to BNR and compare them again cause its been a long time and I cant really remember exactly why I thought it wouldnt work.

Course you could prob just swap the entire water pump, housing and all cause I bet either would bolt up to the engine. I was just looking at swaping the impreller from one to the other cause my pump/housing polished and I didnt want to get rid of it.

 

Kevin you know of any good elec setup's? I've been toying with this idea. It seems like it would be hard to control the water temps when at idle, ect....seems like it would get too cold, unless maybe the pump output changes with rpm or load or something. Seems like if the flow is enough to cool the engine at 8000rpms and 400+rwhp that it would be entirely too much at idle and it would get too cool. I guess the thermostate would control that really, BUT that brings me to my next quesiton.....

You would loose your thermostate housing and filler neck. Seems like it would be a pita to replace those with a custom setup.

Whats your experiance?

Stephen

 

i dont know... but i do know that you can put (and alot of people do) FD waterpumps on the 20b motors (which im assuming uses the same water pump as an FC).... i dont know how cooling is affected with the reverse flow, but the people that use the FD pumps dont seem to be having cooling problems. i wonder why they changed pumping directions for the FD?

 

I've seen a vender selling something to replace it. It looks like what is in this picture.



I'm sure someone will know who it is.

 

Yea, Keith from KG parts sells that part with the AN fittings and a pump, but I dont know what to do for a thermostat, housing, and fillerneck along with brakets to support the alt (which the engine in th pic has). I wend to the Evil7 website and emailed that guy to see if he could give me some more info on it.

Thanks for the pic!
Stephen

 

I wonder if it would be possible to use that adapter plate while keeping the alt in the stock position( to keep the A/C and PS pumps)?