fuel rail whoes

[K4000JB]

hi all just want to pick your brains i know its a long shot but does anyone know if the fuel rail off a hotwire preserp engine is different to a serp engine i ask because i hope to fit an aftermarket ecu and was going to fit the p38 ciol packs behind the plemun but it looks as though the fuel rail maybe in the way on my preserp 4.0ltr
thanks for your help
ant

[Hoover.]

I presume you mean a 4ltr pre cat

[K4000JB]

yeah sorry very tired i want to fit the coil packs off a 4.6ltr serp engine eg. post 94 to my 4.0ltr precat 4.0ltr pre 94 i know they fit a 2000 car as my mate has done it but hes on hols so cant compare them at mo

[GreenV8S]

Assuming you mean a serpentine TVR RV8, the fuel rails are basically in the same place on all the hotwire engines but there are a couple of variations of end fittings so not always freely interchangeable. If you mean a THOR engine, it'll be quite different.

[K4000JB]

quote: Assuming you mean a serpentine TVR RV8, the fuel rails are basically in the same place on all the hotwire engines but there are a couple of variations of end fittings so not always freely interchangeable. If you mean a THOR engine, it'll be quite different.

wot is the thor engine is that the 4.6ltr variant? and would tvr fit this engine to their griff 500 in 2000?
cheers
ant

[AntonyJ]

K4000JB said:

quote: Assuming you mean a serpentine TVR RV8, the fuel rails are basically in the same place on all the hotwire engines but there are a couple of variations of end fittings so not always freely interchangeable. If you mean a THOR engine, it'll be quite different.

wot is the thor engine is that the 4.6ltr variant? and would tvr fit this engine to their griff 500 in 2000?
cheers
ant

Thor is the injection unit, the engine itself will fit , but not with the thor top end.

[coetzeeh]

I belive there are two types of P38 coil packs, but only the earlier version can be used.

Not sure if the look the same though.

[GreenV8S]

K4000JB said:

wot is the thor engine is that the 4.6ltr variant? and would tvr fit this engine to their griff 500 in 2000?
cheers
ant

All the RV8 engines TVR used from the later wedges onwards use the Lucas 14 CUX/Hotwire engine management system and the corresponding hardware. All 'hotwire' installations have basically the same fuel rail, there are some variations in end fittings but the rail itself is always in the same place.*

Landrover went on to use the THOR/GEMS design later which uses a completely different ECU, sensors, intake manifold, fuel rail etc, basically nothing in common with the hotwire setup except that they both go on top of the same basic engine. TVR didn't use this setup.

• Except mine, which has a custom fuel rail just to confuse things.

[K4000JB]

thanks for your help guys i popped into a landrover and 4x4 shop this morning and indeed they do make two different fuel rails for the hotwire F.I. so i will need to track down some with serpentine engine to see how theirs differs or wait a week for my mate to come back
thanks again
ant

[spend]

I thought GEMS was the sagem ecu with traditional style plenum & the Thor was the bosch ecu with a coiled snake on top of the engine. Both come in 4.0 & 4.6 capacities, minor revisions for crank sensor (knock sensors only on Bosh??)

Dave

[350Matt]

Sorry to add fuel to the fire but the P38 coil packs don't have the best reputation for reliability and are quite expensive, I'd recommend a couple of Ford or Citroen coil packs instead

Matt

[AntonyJ]

350Matt said:

Sorry to add fuel to the fire but the P38 coil packs don't have the best reputation for reliability and are quite expensive, I'd recommend a couple of Ford or Citroen coil packs instead

Matt

Can you be more specific Matt, I have a set of each in stores!
There are the ones that are 4x2 coils and then the later ones that are 2x4 coils

[K4000JB]

yeah heard this myself but was told the reliability probs were with the later ones iirc they can be expensive unless you pick up a second hand set on fleabay only advantage is that they are made to fit on the back of the inlet manifold and you can find H.T leads on the shelf
cheers ant