75 v. 83 thermostats for 87-94 cars
05-31-2018, 11:38 AM
#46
Chronic Tool Dropper
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Reminder: unless it’s stuck closed or leaking by/bypassing, the thermostat won’t cause overheating. Changing to a cooler one won’t solve overheating issues. The thermostat does help mask effects of other deterioration, until full-open isn’t enough to keep the engine temp correct. That’s what people see, so the quickest cheapest easiest thing to try is a new thermostat and sealS. New rear seal may solve bypassing issues but otherwise you need to fix the rest of the system. You can’t retro maintenance that’s been ignored in the past, so radiator and pump move to the front. Corrosion In the block is a challenge since few chem cleaners are harsh enough for calcification and corrosion without chewing on the aluminum. Good coolant, change every year or two regardless of how much or little you drive the car.
05-31-2018, 01:04 PM
#48
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The 75 runs cooler when the car is at speed. That's it. Other than that, heat soak and operating temp in a steady state is the same as a car with an 83. But I'm still sticking with my 75c. Jeez guys have any cars blown up running a colder thermostat? It's not that big of a deal.
05-31-2018, 01:16 PM
#49
Administrator - "Tyson"
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At no point did I discuss or recommend taking an over-heating car and trying to "fix it" with a thermostat and a radiator cap.
My suggestions follow regularly accepted guidelines for extending the life of older cars. Lower temp 'stats and lower pressure caps are a common small and easy modification to keep older radiators in the game a little longer (not to mention hoses and other parts).
Set your obvious bias aside and READ.
My suggestions follow regularly accepted guidelines for extending the life of older cars. Lower temp 'stats and lower pressure caps are a common small and easy modification to keep older radiators in the game a little longer (not to mention hoses and other parts).
Set your obvious bias aside and READ.
Application: All Porsche® 928 1978-1995
The Problem: The Porsche® 928 is susceptible to overheating as the radiator ages, or when modifications are made to increase its HP (and heat) output. This is especially true if the car is kept in hotter climates.
The Solution: Replace the stock 83°C thermostat with this brand new thermostat at 75°C. The lower temperature opens the t'stat earlier, and lowers the operating temp of the engine. Made in Germany for Porsche®. A new o-ring to seal the housing is included!
The Problem: The Porsche® 928 is susceptible to overheating as the radiator ages, or when modifications are made to increase its HP (and heat) output. This is especially true if the car is kept in hotter climates.
The Solution: Replace the stock 83°C thermostat with this brand new thermostat at 75°C. The lower temperature opens the t'stat earlier, and lowers the operating temp of the engine. Made in Germany for Porsche®. A new o-ring to seal the housing is included!
Band-aids are great to get you home in a pinch, temporarily remove a problem from an equation if you are trying to diagnose a bigger problem etc.... Putting off the inevitable just to save money is how people wind up on the side of the road hundreds of miles from home.
Your site gives a very false confidence that such "solutions" are a good idea.
If you are driving a 40 year old car & cannot afford to replace a 40 year old radiator that is failing, time to sell the car.
05-31-2018, 02:21 PM
#50
Developer
It would be nice if everybody driving an OB had money for a new radiator, wouldn't it, Erik?
OF COURSE - if the radiator is bad, only replacing the radiator will help. Duh. But you and i know there are plenty of 928's running around with less than perfect cooling systems, and they can be helped.
Low temp thermostats have been available for most cars for decades. They have a place.
Believe me, if I was trying to sell one of our radiators to everybody as my only go-to for everyone that says "my temp gauge is running a little high" you'd be screaming about that. So I offer some other possible solutions that may help an owner and they cost a lost less - and that's a bad thing?
OF COURSE - if the radiator is bad, only replacing the radiator will help. Duh. But you and i know there are plenty of 928's running around with less than perfect cooling systems, and they can be helped.
Low temp thermostats have been available for most cars for decades. They have a place.
Believe me, if I was trying to sell one of our radiators to everybody as my only go-to for everyone that says "my temp gauge is running a little high" you'd be screaming about that. So I offer some other possible solutions that may help an owner and they cost a lost less - and that's a bad thing?
05-31-2018, 02:46 PM
#51
Official Bay Area Patriot
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Something I did that actually helped the flow on a 944 was to put that radiator cleaner or flush stuff from Prestone into my radiator facing downwards after I removed it, then filling it up with water and letting it sit for a couple hours. Once I flushed I was surprised how much s**t came out of it. Backward flushes produced even more gunk.
Worth a try on old radiators that are out of the cars.
Worth a try on old radiators that are out of the cars.