Matty's first 1st Gen

ok, i have water temp mechanical gauge, I would like to place the sensor in the drain plug on the bottom of the rad, would this be a good location, and what size is the hole, so i can buy an adapter. And lastly, i was just thinking while premixing my gas today, could the oil have a negative effect on fuel filter?

~matt

RotorMotorDriver

iTrader: (1)

First of all, the drain plug on the bottom of the radiator isnt a good spot for the gauge. Basically because by the time the water gets down there, its already been cooled. You would want the gauge towards the top of the radiator, on the water pump housing somewhere (idealy), or on the block somewhere in a coolant passage. As for premixing, if youre using 2 stroke oil, it shouldnt have an effect on the filter at all seeing as its meant to be pumped through filters and carburetors. most oils that are meant to be mixed (IE - MMO, 2 Stroke, whatever) are fine with being run through filters and whatever. Hope that helps .

~T.J.

NanaimoRx-7

Well since I just installed an Autometer Water Temp Gauge I should be able to answer your questions.

First off, if you have the ability to tap the water pump housing to NPT threads I'd almost recommend it over the hassel of finding the fittings to fit the sender in the stock hole.

In the end I decided to use the existing hole on the water pump housing (Choke Temp Sensor). The difficulty lies in finding a metric to NPT conversion fitting. You're looking for a 16x1.5 to NPT fitting. The one I found was 3/8 NPT. If you want to use the stock sender location or the drain plug on the intermediate housing I beleive the thread pitch is 10x1.5.

My source for the fittings came from an Industrial and Mill supply, it cost $16CAN. Good luck with the install.

KYPREO

I wouldn't suggest the drain plug on the intermediate housing, as this is on the cold side of the engine - you will be sensing around 10 degrees cooler at the position - you almost certainly want the sensor in the water pump housing in the stock position, or at the least, tap a thread in the outlet flange/thermostat housing. This position is the hottest area of the cooling system.

NanaimoRx-7

Yeah I forgot to mention that that's the reason I chose the water pump housing for the sender location. The only reason I was thinking about using the drain plug was because my stock gauge was acting up now and then (spiking up to 3/4) and I wanted to leave it intact temporarily to compare the new against the old.

The only fault I see by using the conversion fitting is that it takes two fittings to adapt the sender which makes the depth of the sender slightly less than a single bushing. I hope this is only having a marginal lowering effect on my readings if any at all, or perhaps a slight delay. I'm not totally sure.