Serp Oil Pressure sender

[Richard 858]

I'm sure this has been covered before but I'm looking for a suitable sender for my 98 450 (white faced gauges, caerbont I think). Current one never reads more than 35psi drops as low as 10 when warm, this is after 12,000 miles since rebuild & 20/60 Millers Semi Synthetic (in the summer). I reckon this is reading low so looking for suitable replacement & wondered if there's a better option than Clever Trevor at £40 odd ? As ever any help much appreciated.

[Richard 858]

Thanks to all, I'd already ordered the cheap E-bay one (0-100psi) before I looked back at the thread for the "new" alternative, so I'll see what difference it makes to mine. Couldn't agree more with getting to know your own by working on it yourself, am getting a somewhat perverse pleasure from rolling around on a creeper under mine !

[Richard 858]

I've also ordered the slightly more expensive alternative from Ebay as per Dave's (Chimpongas)suggestion although car up on jacks for a few weeks for winter work so won't get proper comparison until spring (apart from idle cold & warm whilst stationary) Intend to try 0-80 psi sender first.

[Richard 858]

jojackson4 said:

Also haveing a go with the sender and mag sump plug and the v8 filter

Let us know how you get on with the filter, do you mean the Cummins fibreglass element one ?

[Richard 858]

ChimpOnGas said:

Edited by ChimpOnGas on Friday 29th November 14:01

Right Chaps, now fitted this one (as per Dave ChimpOnGas) 0-80 psi, £26.85 Ebay - supplied by a company called Technisol (DM Auto & Marine Parts) near Cambridge. It's actually from an outfit called ISSPRO from Oregan in the U.S.
As far as fitting goes it's straight forward, just needs earthing. It is however approx 50% longer than the original so not much room between terminals & cross brace, but it does fit. As explained before my car is on jacks for fettling so readings are stationary in a partly heated garage. Engine is a N/A 450 decatted but otherwise standard, running on Millers CSS 20/60 oil.
Cold Idle: 65 psi
at Water Temp 60 degrees - Idle: 55 psi & @2500 rpm: 70 psi
at Water Temp 80 degrees - Idle: 45 psi & @2500 rpm: 65 psi

I'll keep this one in & see how it does when back on the road (with SC) in the spring.

Hope this helps.

Edited by Richard 858 on Wednesday 11th December 14:02

[Richard 858]

Chuffmeister said:

Hmmm… those readings are quite different to the original sender then

On the same basis my original readings were 30-35 psi lower ! As I believe my engine to be healthy (15,000 miles on full rebuild & 275 hp at flywheel) I would surmise these new readings to be more accurate, particularly on fairly fresh 20w60. I think it will also be useful to show a range of pressure more central to the gauge rather than it always reading in the lowest third regardless. It will now be easier to tell on the gauge if I do get a distinct drop in pressure.

[Richard 858]

Chuffmeister said:

If you know your car to be healthy, I guess you could get any sender within reason and just look for changes.

You're absolutely right, I really don't know why I bothered ! Oh yes, that's it, wanted to experiment & gladly act as a bit of a guinea pig for the benefit of others. Dunno why I'm bothering with any other improvements & mods, car runs ok as it is. I heard a nasty rumour the other day that the earth might not be flat ! Do you think anyone will ever volunteer to sail to the edge & see what happens !!

[Richard 858]

ChimpOnGas said:

Bad day Richard?

No Dave, pretty productive actually. After making a few work related calls this morning, got into the garage, did oil pressure sender experiment, lunch & PH post, removed trumpet base & swirl pot to send off to SC Power for alterations ready fro return with SC 500 kit before Christmas !!! Just being a bit sarky about Chuffmeisters post, only joshing though ! Mind you the man certainly knows how to use a camera !!

[Richard 858]

Richard 858 said:

Right Chaps, now fitted this one (as per Dave ChimpOnGas) 0-80 psi, £26.85 Ebay - supplied by a company called Technisol (DM Auto & Marine Parts) near Cambridge. It's actually from an outfit called ISSPRO from Oregan in the U.S.
As far as fitting goes it's straight forward, just needs earthing. It is however approx 50% longer than the original so not much room between terminals & cross brace, but it does fit. As explained before my car is on jacks for fettling so readings are stationary in a partly heated garage. Engine is a N/A 450 decatted but otherwise standard, running on Millers CSS 20/60 oil.
Cold Idle: 65 psi
at Water Temp 60 degrees - Idle: 55 psi & @2500 rpm: 70 psi
at Water Temp 80 degrees - Idle: 45 psi & @2500 rpm: 65 psi

I'll keep this one in & see how it does when back on the road (with SC) in the spring.

Hope this helps.

Edited by Richard 858 on Wednesday 11th December 14:02

As a very late follow up comparison & after covering approx. 2,000 miles (after supercharger fitted and on the same oil) since fitting this sender the readings have dropped across the range by 5 psi on average, so still happy with the outcome.