no coolant sensor? engine is air cooled what to do?

For discussing how to choose sensors and create a wiring harness for all Bowling and Grippo versions of the MegaSquirt® EFI controller.
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infinkc
MegaSquirt Newbie
Posts: 10
Joined: Thu Jun 29, 2006 4:36 pm

no coolant sensor? engine is air cooled what to do?

Post by infinkc »

my engine is air cooled, is there any option for the coolant sensor?
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LeslieTroyer
Helpful Squirter
Posts: 35
Joined: Tue Nov 20, 2007 11:46 am

Post by LeslieTroyer »

most people either use cylinder head temp (CHT) or oil temp. VW used CHT on their early EFI (I have a couple of CPU's from 69-72) -- On the engine I just stripped the CHT also had an oil passage up to it..

Les
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steamer
MegaSquirt Newbie
Posts: 10
Joined: Wed Aug 24, 2005 11:59 am
Location: Tucson, AZ

Post by steamer »

I mounted a coolant sensor to the tins about 1/4" from the fins on the cylinder #2 (VW). Works fine, although I did adjust the various tables to that the engine is warmed up at 120 degrees.
Steamer

MSIIv3 on a 2332 VW
T25 Intercooled Turbo
JAW WBO2, fuel and spark control
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devastator
Experienced Squirter
Posts: 333
Joined: Mon Feb 11, 2008 10:19 am
Location: Kinda near Tucson Arizona

Post by devastator »

I mounted my sensor inline with the external oil cooler and just modified the tables for the range I wanted.
Sandrail-ACVW 2276 cc, Turbo
MS-II W/spark burning E85
The sand must be punished. :twisted:
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msoultan
Helpful Squirter
Posts: 58
Joined: Sun Jun 27, 2004 11:04 am
Location: Long Beach, CA - USA

Re: no coolant sensor? engine is air cooled what to do?

Post by msoultan »

infinkc wrote:my engine is air cooled, is there any option for the coolant sensor?
I modified the MS so that I could use the temperature range reported by my head-temp sensor on my aircooled engine (vw bus). I think this is the most reliable and responsive method.

Using the coolant sensor can be problematic, especially on warm-starts. If you have it under the engine, the sensor will cool down but the engine will stay hot. In the case of the vw bus (and other l-jet setups), I think there's a good reason that the cold-start sensor is right above the case and the EFI head-temp sensor is mounted on the heads.

see this post for more info:

viewtopic.php?t=27268&highlight=
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