ROSHX7

I was browsing WALMART and found they got an AC DELCO Oil filter for our RX7s! Isn't AC DELCO GM only?! How the hell do they make oil filters for imports? And is this OIL FILTER a good one, like a way better choice then FRAM?

Felix Wankel

AC Delco makes aftermarket parts for almost everything...

Go to the dealer and get a Mazda filter. Their oil filters and thermostats are the best.

Jerk_Racer

Get Purolator One. You'll be happy.

jerk_racer@hotmail.com

ROSHX7

I have constantly seen people say that the MAZDA OEM THERMOSTAT is like the BEST ONE ... but why exactly?...what's wrong with say a STANT THERMOSTAT?

tesla042

All I know is that I've heard many, many stories about people who put in generic thermostats, and they either don't work properly to begin with, or fail after a VERY short time.

I've been using delco oil filters in this rx7 exclusively ever since i've had it (about a year), never had a problem. I've come to the conclusion that it really dosn't matter too much what filter you use, as long as it's not fram , and you change it often..

-Tesla

SureShot

I have compared mazda vs. other thermostats. The others don't all have the bleed hole, and on some the bypass valve dosn't reach the bypass seat underneath.

FPrep2ndGenRX7

There is a good chance that AC Delco doesn't even make there own oil filters. Its not uncommon for companies to have products simply labeled to be sold as there. It certainly is cheaper in some cases.

Jahoo88

If you compare the Delco and the Mazda filters, you'll see that the delco is a little bigger then the Mazda. Also i read somewhere that Delco filters are very good.

BBW

Because rotary engine has a hot zone and a cold zone, coolant is circulated between the hot zone and the cold zone to reduce thermo distortion. Even when the thermostat is in the close position, coolant is supposed to circulated between the hot zone and the cold zone. Mazda thermostat for rotary engine has a bottom bypass valve for this purpose.

Another word, if one run his/her rotary engine without a thermostat, engien most likely will be destroyed through overheating/ thermo distortion.

mazdaspeed7

Unless youre cooling system is NOT up to par, your car will run too cold without a thermostat(ask me how I know). The only damage would come from idling for a long time, where the engine would overheat. The waterpump cant circulate enough water at idle to keep enough water flowing through the rediator to keep the engine cool. Any time youre driving above 50 mph without a thermostat, the car would over cool, which is not good for the engine, but it isnt going to blow up on you.

ROSHX7

That is very true, when I installed my STANT thermostat, I noticed it didn't have a bleed hole at all. Hmm, so this is REALLY BAD eh?!..ok, time to visit mazda parts!

BBW

This above statement is true for piston engine. See the following link:
http://mrmazda.members.atlantic.net/cfaqtext.html#TSTAT

You can also get the same information from this book.
The Wankel Rotary Engine : Introduction and Guide
by Harris Edward, Dark

easy p-cheesy

I know people who have been running with no thermostat and it just runs colder than with. its not destroying their engine.

NZConvertible

Running too cold does wear your engine out much quicker. You should always run with a thermostat. It can cause overheating because the water moves faster (no restriction form t/stat) and so can't pick up as much heat.

ka8legend

It can also run rich while you're just cruz'in.

mazdaspeed7

I did not say that, I said it wouldnt blow up. But I do not recommend running without a thermostat. If you must, youre not going to kill your engine if you keep a watchful eye on the temp guaue, but it obviously isnt good for the engine.

Dak

Here is a link someone posted awhile back about oil filters.
http://members.nbci.com/minimopar/oilfilters.html

Dak

Shoot it says page not found.It used to work damnit.Maybe it will work tomorow.Sorry.

BBW

I read your post a little bit too fast. Sorry about that. You were right in saying that engine wouldn't blow up.

However, there is another issue you must consider. The temp guage reading is an average reading. It doesn't tell us anything about temperature variation. Running a rotary without a thermostat when engine is cold encourages thermo distortion; the rotor housing could be warpped because of stresss from thermo distortion. Furhtermore, the apex seals can have a shorter life due to additional factor:
#1 Colder running temp increases seal wear (this is a normal factor).
#2 Thermo distortion can increase seal wear as well ( this is the additional factor).

#1 factor is common to both the piston engine and rotary engine. #2 factor is more unique to rotary engine.

tesla042

here's a copy
http://www.frankhunt.com/FRANK/corve...lterstudy.html

ROSHX7

I read the articles, quite interesting. To quickly summarize it...STAY AWAY FROM FRAM !!!!! Pennzoil & Quaker State Oil filters are FRAMs as well! Get Puralator, Mobil1 or Wix instead!

SO SAY YOU TRUELY LOVE YOUR RX7 and want to preserve the performance it for as long as you can...so getting this would do it right:

1. Budget: CASTROL GTX Oil /w Puralator Oil Filter
2. Bling Bling: Mobil1 Synthetic Oil /w Mazda OEM Filter

Cool?