Rednation

I have heard putting in a gallon of diesel into your tank when you fill up will help with lubrication in the rotors is this true or just BS.

farberio

iTrader: (7)

Sounds like you heard someone who has heard of premixing but doesn't know **** about it.

Search for 'premix' to get some answers.

Polishammer

With the old diesel, might be, although I have never heard that. New diesel for sure not, as guess what, new diesel have lost a lot of its lubricacy (sulfur) and we are also adding 2-stroke oil

RX7Tuner.

Yes, infact your car will run on pure diesel. It has a similar engine as the Kompressor engine found in the more expensive mercedes. If you have a turbo model, you can use old grease from a deep fryer. It helps raise the compression for better combustion. Now if you really want some power...use 87 octane.

Brian

NCross

iTrader: (18)

diesel in a gasoline engine would create compression problems and just wouldn't start... Enough diesel would actually blow it pretty good.

toplessFC3Sman

iTrader: (1)

diesel has a much lower equivalent octane rating than gasoline, so you would have significantly less knock protection if you were able to start the car in the first place. If you did manage to coax it to life and keep it running, dont put much load on it or it will knock/detonate/whatever you want to call it, and then bye bye apex seals.

slow_2ed_gen

i'm pretty sure diesel is like 48 octane...

Pele

iTrader: (28)

Diesel does not have octane.
Diesel has a CETANE rating, which is the OPPOSITE of OCTANE. Cetane refers to the fuel's ability to ignite by compression. Not to resist it.
http://en.wikipedia.org/wiki/Cetane_number

Diesel in your engine won't ruin anything... It just plain won't run...

To ignite diesel, you need compression upwards of 17:1 with forced induction. 20:1 N/A... Anyone have these kinda numbers on a Rotary? Physically impossible due to the geometry of the rotors. 10:1 max. Any more and the dish of the rotor is so shallow that it actually splits the combustion chamber in two, one near the leading plug, one near the trailing.



+1 to the only other useful post here.

toplessFC3Sman

iTrader: (1)

no, diesel can be run at lower compression ratios than 17:1, it usually just requires a smaller pre-chamber to start in, and is not as efficient or powerful as your modern direct injection, high compression ratio turbodiesels. I know it's rating is a cetane rating, thus I said "equivalent octane", so we could *try* to compare apples to apples.

Basically, diesel is made to be easy to initially ignite because it needs to combust solely because of compression (thus being a compression ignition, aka CI, engine), whereas gasoline is made to be more difficult so that it takes the spark to do it. I really doubt you could get the engine to start in the first place, and definately not cold, but maybe if it were really nice and toasty from a nice hard run, and you started the car just from the gas left in the fuel rail and lines, until the diesel began to be drawn in, at which point the engine is pretty hot, you may get it to ignite for a few cycles before it dies or you damage something.

CrackHeadMel

iTrader: (2)

i was recently schooled in a diesel conversation, so will pass this along

diesel if run in a typical car berated or fuel injected manner would require aprox a 7:1 comp ratio, the diff being a diesel engine compresses just the air, and then the fuel is injected and combusts almost immediatly, and gasolien engines compress both the fuel and air

some good information is mixed in this thread

https://www.rx7club.com/auxiliary-injection-173/deisel-injection-648515/

-Jacob

ericgrau

iTrader: (1)

Kiss your engine goodbye if you do this. No joke. Only way it might survive is if there's not too much diesel in there.

You can add TCW-13 2 stroke oil when you fillup your gas tank, no more than 1/2 oz. per gallon of gasoline. This will provide extra lubrication for a little less wear and a little better compression. Gas stations, walmart, etc., etc. carry it.

RX7Tuner.

I run 1oz per gallon. And you won't get any better compression.

ericgrau

iTrader: (1)

I didn't say the improvement would be noticeable. Maybe I should have said "tiny" instead of "little"? That's what I meant. But sealing is part of what the lubricant does. Heh, compared to zero lubrication I bet the improvement in compression would be noticeable. Plus if you keep wear down and keep the engine clean that'll help compression in the long run, no?

got_boost

iTrader: (16)

i dont remember where but i know i saw a tv show that actually tried those.
its either Mythbusters or Top Gear.
but they actually got a Volvo going with old fast food used oil.
and the car actually ran "great" !!!

RX7Tuner.

Lubrication is important but you are getting it through the OMP. Adding two stroke oil to an engine with an OMP isn't going to add compression. If you have zero lubrication than your engine will not be running for long. I personally premix so I agree that it's better but if it's a stock engine, it's pointless.