Lower Temp Thermostat

[Granite CB7]

^I paid $72 shipped for the t-stat (eBay) and $54.50 for the fan switch (King). It's a really nice setup, I like it alot. And during the winter, which is now pretty much, the t-stat is closed at all times unless the car idles for a long time, pretty much the same thing as my Beck Arnley 170* one.

[Otto]

Any before and after MPG numbers?
I'd especially like to see the difference in MPG (and HP/TQ) from stock ECU to dyno tuned. I don't think you'd be burning much more fuel, at least not as much as some people make it out to be. Not sure of any numbers though.
I'd stay stock myself for my DD, might be a fun thing to try (especially if I could also dyno tune to see what improvements could be had) on a second car.

I'll take a stab at some pros/cons:
I don't see how this would cause fuel to be unburnt. The fuel should be fully burned regardless of engine temp unless something is wrong with it. Since the cat. should be functioning before the coolant temp gets anywhere near that high, I don't think it'd do much to the cat either.

The lower temps will mean a slightly lower viscosity for the oil, also longer run times needed to evaporate any moisture from the oil and exhaust.

[NAiL05]

^I paid $72 shipped for the t-stat (eBay) and $54.50 for the fan switch (King). It's a really nice setup, I like it alot. And during the winter, which is now pretty much, the t-stat is closed at all times unless the car idles for a long time, pretty much the same thing as my Beck Arnley 170* one.

Thats actually not bad I was expecting it to be a lil more.

[ZigenBallZ]

wow... an on topic, pertinent thread revival...

good schtuff.

[Granite CB7]

Any before and after MPG numbers?
I'd especially like to see the difference in MPG (and HP/TQ) from stock ECU to dyno tuned. I don't think you'd be burning much more fuel, at least not as much as some people make it out to be. Not sure of any numbers though.
I'd stay stock myself for my DD, might be a fun thing to try (especially if I could also dyno tune to see what improvements could be had) on a second car.

I'll take a stab at some pros/cons:
I don't see how this would cause fuel to be unburnt. The fuel should be fully burned regardless of engine temp unless something is wrong with it. Since the cat. should be functioning before the coolant temp gets anywhere near that high, I don't think it'd do much to the cat either.

The lower temps will mean a slightly lower viscosity for the oil, also longer run times needed to evaporate any moisture from the oil and exhaust.

Before I post, that part # for the Mugen T-stat that I posted will work on an F22aX or similar motor, if it's for an H22 for example, use the Prelude one b/c of its larger t-stat.

I did not see a decline in MPG at all. I recently got 475 to a tank that was mostly highway which I don't usually do, and it was in the cold weather, and the t-stat was closed most of the time. In the summer, no decline at all.

The only reason why I wanted the t-stat and fan switch is to have the car run alot cooler during the summer, I felt my CB ran alittle hot (but fine by Honda's standards). During 90*+ days, you could just tell how much the motor hated it, very sluggish. As opposed to when it's below 50* the motor is much happier. Also, valve seals are a common problem along w/ misc oil leaks, and a hotter engine will accelerate those issues IMO esp. the valve seals. It's not so much a DD or racecar thing, I would highly recommend this on a DD even, it's not that extreme at all.

I would tend to agree w/ your thoughts on this, and this has always been debated, but having the motor running alittle cooler during the summer is not a bad thing at all.