Inliners International Forums General Discussion Hi Performance Viewable thermostat housing

I started building a viewable thermostat housing were you can actually see the thermostat work while the engine is running. I make several versions and would like to make them for inline engines. I have a question. Is the water neck bolt pattern the same for Chevy v8s and straight 6 engines.216,235 and 194-292. Chevy v8s are 3.25 inches center to center. My web page has one you can see working on a car if you want to see what it is. http://www.coolviewthermostat.comm

Sounds neat.
Link does not work
This one might

http://www.coolviewthermostat.com/


MBHD

have you had one on a car for a very long time yet? My concern is how long will you be able to see the "stat" before the coolant stains up the housing 'til you can no longer view it workings.

Yeah, its probably like those clear valve covers that were made back in the 60's. After a few cycles of hot oil sprayed on them they got hazy.

The first prototypes I made were a year ago. All 3 are still on the trucks I installed them on and are driven on a regular basis. You can still see everything fine with no buildup on the inside of the glass. The viewable tube is made of steam boiler site glass. (Pyrex) The surface will not cloud up like plastic does. Also part of the problem with the see through valve covers is the oil builds a coking layer (burned oil) on the plastic. This doesn't happen with coolant.

Update:
Good news. I just talked to Tom Langdon and all of the 216,235 and 194-292 engines have the same water neck bolt pattern except a very few of the pick truck engines. Tom was very helpful, Thanks Tom.

I kinda like them, not sure if they have any real practical use other than being able to see if you blew a head gasket and you'd know that sooner just by driving.

Yeah, but what a conversation starter.

Here is some more interchange information but for Mopars. I researched this information for the Mopar version I make but is good to know for interchanging water necks and thermostat on any Mopar engine.


Here are the basics. There are essentially two different water outlet bolt patterns used by all Chrysler engines from 1924-2003 . One is the older large size with a center to center bolt pattern of 3.25 inches. This pattern was used on all v8 engines from 1951 to 1978 and all flathead 4, 6 & 8 inline engines back to 1924. The thermostat diameter is 2.49 inches for this size housing. The other water outlet bolt pattern is 2.875 inches. This pattern was used on all slant 6 engines and the newer small block engines made after 1978. The thermostat diameter is 2.125 inches for this size housing. All flathead 4, 6, 8 inline, Slant 6 and V8s made before 1979 use 3/8 inch bolts. V8 Small block engines 1979 and newer use 5/16 inch or metric size bolts.
Things get more complicated. Even though the 3.25 pattern is the same for all v8s from 1951-1978 many of the 1950s water outlets have bypasses built into the housing. This is also true of most of the flathead 6 & 8 inline engines. If you plan to change to a different water outlet on these engines it is important to know what the bypass did and is changing to a non bypass water outlet going to have an adverse effect. Bypasses are used on these engines mostly to keep from having hot spots in the cooling jacket as the engine comes up to temperature because the bypass recirculates the water in the engine. They are also used were the winter temperatures are very cold so the heater warms up faster. In addition some of the thermostats were constructed to work in conjunction with the water outlet’s bypass and use a different size Thermostat. Most of these thermostats are 2.55 inches. Some of the small block v8 aftermarket manifolds have both the 2.875 and the 3.25 bolt patterns which allow you to use either size water outlet. Also not all water outlets use the same size radiator hose.

Can you use Chevy water outlets on a Mopar? The 3.25 inch bolt pattern is also the same as the Chevy v8s and they can be made to work on a Mopar engine. However it should be noted that the recess for the thermostat on Mopar engines is in the water outlet and Chevys are in the intake manifold so using a Chevy water outlet on a Mopar is not a slam dunk. In addition the housing of the Chevy is about 1/4 inch smaller diameter so it doesn’t cover all of the mounting area and looks a little odd. The thermostat size used by Chevy is the same as used with the slant 6 and 1979 and newer small block v8s.

Here are a couple shots on my brothers 51 Ply with one mounted on it.

That's pretty wild! One of my personal bad-luck items are thermostats. I don't think I've ever had one that worked the way I thought it should. LOL It's always cool to see things work.

OK, i'm impressed! :-) very nice! congratulations.

How much? I may want one.

The price for the Chevy or Mopar units are $140 You can purchase them on my web site and all of the other prices are there too.
Thanks for asking.