Has anyone used the green o-rings that RC Engineering sends cleaned and rebuilt injectors back with? I'm reading mixed opinions in my searches. I just got my primary injectors cleaned and my secondary injectors bored out to 1300cc.

So, my questions:

Has anyone used the green o-rings with *no* problems? How many miles/how long?

Has anyone used the green o-rings and *had* problems that could be traceable to the o-rings? Again, how many miles/how long?

If replacements are needed, are the RP/RX7.com ones sufficient? Or OEM FTW?


I don't want to mess around in the fuel systems with something that may fail on me.

 

My story:

https://www.rx7club.com/showpost.php...&postcount=255

 

Dengit.

OEM set of O-rings, eh? If that's the only set that works, I suppose I need to bite the bullet and buy them expensive ones.

Unless someone else can chime in to the effectiveness of RP/RX7.com's $16 set.

 

I also had a horrible experiance with RC's injector o-rings. They left a huge fuel leak and flooded the hell out of my engine. I will never use there orings ever again.

Buy the oem orings and you will be happy when you try to start your engine. They are worth the extra money.

 

What about Witchhunter? Don't they use Viton o-rings (and are cheaper than RC to boot)?

 

Not alot of miles on mine yet, around 1200. No fuel leaks thus far. I find it hard to believe that a company such as RC would risk a good rep on cheap orings. I'm no expert, but there are alot of old garage tricks that people seem to forget over the years. Everything needs to be properly installed. I always go the extra mile when working on my cars. I lubed my injector orings before install. Everything was new including fuel atomizers and new rubber rings where the manifolds go in.

How can a stock injector install flood an engine anyways? Do you mean it flooded all over the engine?

Terry7

 

Now, I only had an issue with one injector. I didn't replace all the o-rings from the other ones (although I should have while I was there).

 

Well, I just called Ray to order the o-rings. Not too bad...$60-something. I was expecting $120-something as described at RP.

Cheap insurance. I'm game with that.

When I get the OE ones in, I'll take photos to compare.

 

Ok...I took some photos. Pardon the noisy profile photo. I didn't feel like re-taking it.

RC Engineering on the left, Mazda on the right.




RC Engineering on the bottom, Mazda on top.

So, it appears that the larger, upper o-ring is the same I.D. and O.D. But for the smaller, lower one, it seems like the RC Engineering one has a slightly larger O.D. Perhaps this causes issues by stretching and warping ever so slightly in the fuel rail?

 

The RX7.com set for $16 are exact Viton replacements. I've been successful with them for over 2 years.

I had my first set of injectors done by RC and I didn't like the O-rings supplied as well.

My second set of 850cc injectors from WitchHunter had all of the correct O-rings.

+1 on properly lubing the O-rings during install.

I use Parker's O-Ring lube, and I believe Pettit uses the same during assembly.

:-) neil

http://www.rx7.com/store/rx7/fdfuel.html

 

$60 for o-rings is a crime. Thbe reason many people have problems is because they don't lube up the injectors prior to installation and the o-rings can tear. I use a quick blast of wd40. Not a single problem in years.

 

I'd like to say that I always lube the rings and I have seen more than one set of them fail. Also, I've seen several different flavors/color of the RC Eng o-rings. It seems they just get a batch of whatever is available and use them.

 

FWIW, be careful with WD-40 and other petroleum oils on rubber parts including o-rings and bushings, although VITON is petroleum oil tolerant.

Parkers O-Ring Lube is a barium soap so it won't deteriorate rubber.

My machinist likes to use the green Palmolive liquid dish soap as a rubber bushing lubricant as well.

:-) neil

 

FSM says motor oil should be used.

 

Yep, because the factory/OE ones are VITON which are petroleum compatible.

:-) neil

 

I've sent out tons of green seals and had no bad reports... Like stated before a big gun like RC wouldn't put their ***** on the line for cheaper seals. If they are good enough for them then they are good enough for me
I'm still debating what the best lube is for the o rings? I guess as long as its not pb blaster you're ok... HA!