33 replies to this topic

[Scott McKay]

I have a 1996 1.8 with a Rossini in it. It has a new, large Blackworks aluminum radiator. Running alone, it won't really go over 180 degrees. Put it in a draft, however, and you can get to 225 or more really quickly. When should I get out of the draft and get some air? Meaning, how hot is too hot? Thanks.

-Scott

[James York]

225 is too hot. I don't know exactly the point the 1996 pulls timing but I am sure it is being done at that high of temp.

I shoot for no more than 205 in the draft. Maybe 210 max.

[Rob Burgoon]

If we're going to talk about coolant temp, we gotta talk sensor location.

My sensor is in the heater hose and I think it reads about 210 in the draft in 90* weather

[Rob Burgoon]

Scott, have you sealed your gaps around the radiator?

[KentCarter]

If the photos on their site are representative, it doesn't look like a cross flow or multipass design. I may not ever be enough.

[MazdaSteve]

I am having similar overheaing problems. Have a 1990 with one of Bobs RE War Eagles in it. Car puts out good power when cold. After 4-5 hard laps the engine temp gets up to 205 and it feels like the car dropped anchor; up to 210 if I run in the draft. I have new hoses, 54mm Koyo, Water Wetter, timing has been adjusted between 14-16, air flow meter adjusted by Thill & Rossini on his dyno, have run stock thermostat, gutted and no thermostat. Same problem. Using the Mazdaspeed air deflector to keep the air going through the radiator and everyhing is sealed and taped off.

Anyone have any ideas how to keep this beast cool?

[KentCarter]

I am having similar overheaing problems. Have a 1990 with one of Bobs RE War Eagles in it. Car puts out good power when cold. After 4-5 hard laps the engine temp gets up to 205 and it feels like the car dropped anchor; up to 210 if I run in the draft. I have new hoses, 54mm Koyo, Water Wetter, timing has been adjusted between 14-16, air flow meter adjusted by Thill & Rossini on his dyno, have run stock thermostat, gutted and no thermostat. Same problem. Using the Mazdaspeed air deflector to keep the air going through the radiator and everyhing is sealed and taped off.

Anyone have any ideas how to keep this beast cool?

SD radiator.

[pat slattery]

SD Radiator +1

[Danny Steyn]

I have a 1996 1.8 with a Rossini in it. It has a new, large Blackworks aluminum radiator. Running alone, it won't really go over 180 degrees. Put it in a draft, however, and you can get to 225 or more really quickly. When should I get out of the draft and get some air? Meaning, how hot is too hot? Thanks.
-Scott

Scott - I run Rossini's engines too. I have run several different radiators, both with thermostat and without. I prefer to run in the 180-210 range but have had occasions in the summer when running in the draft that I have seen 225+. However, as mentioned I would check the radiator surrounds, and I would make sure you calibrate your temp gauge - we have seen gauges read more than 10 degrees above actual temp.

I try to show half a nose in the draft if I start getting around 220F. Temps will fall quickly when you do this

[KentCarter]

Scott - I run Rossini's engines too. I have run several different radiators, both with thermostat and without. I prefer to run in the 180-210 range but have had occasions in the summer when running in the draft that I have seen 225+. However, as mentioned I would check the radiator surrounds, and I would make sure you calibrate your temp gauge - we have seen gauges read more than 10 degrees above actual temp.

I try to show half a nose in the draft if I start getting around 220F. Temps will fall quickly when you do this

Wow.... what radiator do you have?

[Danny Steyn]

Kent - SD
I also realize I need to amend my post - my in-car gauge is over reading by around 10 degrees at 200F - so my real max temp number is closer to 215F

[Scott McKay]

My gauge is located in the thermostat neck that feeds the upper hose for the radiator. I will check the shrouding tonight.

[FlyByYou]

I run about 195, never seen 220

Gary

[Scott McKay]

I have no shrouding around the radiator. It appears the air is not all being forced through the radiator. Someone said MazdaSpeed makes a deflector to force it in?

[RussMcB]

Thread hijack - hope it's not offensive ...

 

For those who have installed coolant sensors in a radiator hose, did you choose the top hose or bottom, and why?

 

I've ordered one of these to install both a temp and pressure sensor (it has two ports): http://www.advanced-...products_id=123

 

Regarding radiator shrouding, I looked at mine and decided it'd be a winter project because it needs shrouding on top, bottom and both sides.

[Tom Hampton]

My Guage temp is in the top hose. It's the inlet into the radiator...the outlet would be misleading cool. The upper radiator hose is still cooler than the rear head outlet, but that spot can heat soak from the exhaust manifold and read too high.

[suck fumes]

Be careful dropping $600 on an SD. They seem to fail and leak really quickly these days internally where it's not fixable. Mine started leaking after only 5 events! The older one I had in my 99 lasted a couple seasons then decided to puke.

[Keith Novak]

Is non-stock shrouding even legal?  The rules state that the OEM plastic piece at the top is legal.  I've seen it reinforced with duct tape and also replaced with an aluminum piece of the same shape.  I suppose the aluminum one could go under the any radiator is allowed provided it mounts in the stock location rule but to me that seems a stretch particularly because the rule states a specific legal part number.

[DrDomm]

Is non-stock shrouding even legal?  The rules state that the OEM plastic piece at the top is legal.  I've seen it reinforced with duct tape and also replaced with an aluminum piece of the same shape.  I suppose the aluminum one could go under the any radiator is allowed provided it mounts in the stock location rule but to me that seems a stretch particularly because the rule states a specific legal part number.

 

I've seen so many cars with these that I re-read the rules last night, and I don't understand how it's legal.  I assume it must be since "everyone" is doing it.

 

Someone point us to the rule that shows it's legal, please.

[Bench Racer]

I've seen so many cars with these that I re-read the rules last night, and I don't understand how it's legal.  I assume it must be since "everyone" is doing it.

 

Someone point us to the rule that shows it's legal, please.

Under Cooling System:

 

All cars may install the upper radiator seal, p/n NA75-50-OK7A. Obviously a Mazda p/n.