RV8 Thor and GEMS Inlet Manifolds

[chassis 33]

Doesn anyone know if the inlet manifold for a GEMS engine is the same as a Thor manifold. Obviously the bits tht bolt above the manifold are very different, I'm wondering if a GEMS plenum and trumpet base will bolt to a Thor manifold.

The Thor part mumber is HRC2095

Regards
Iain

[stevieturbo]

Check over on the V8 Forum ( if its working again, I cant seem to access it at the minute )

A guy posted up a few pics a few months back of his Thor setup

[chassis 33]

Will do, the issue is I want to use the later Bosch injectors, but they're shorter than te Lucas hotwire ones, so I'm wondering if I can use the Thor manifold that I have but keep the traditional plenum type design, albeit the plenum isnt the same...

Regards
Iain

[v8 racing]

Hi lain unfortunetly they are totaly different, the intakes are actualy in different places so there is no way you could fit a trumpet base to them

[chassis 33]

Is that the GEMS trumpet base or Hotwire, I know Thor and hotwire dont match up, but not sure about gems.

Regards
Iain

[stevieturbo]

From what I recall, the Thor doesnt use regular injectors, and does indeed use the short variety anyway.

[eliot]

Some detailed photo's of the thor manifold can be found on my rover v8 manifold archive:
www.mez.co.uk/ms12.html

The fuel rail is "returnless" - whereas std rover item is returned - not that there's anything to stop you converting back.

[v8 racing]

chassis 33 said:

Is that the GEMS trumpet base or Hotwire, I know Thor and hotwire dont match up, but not sure about gems.

Regards
Iain

The gems is the same as the hotwire

[chassis 33]

Cheers folks, I think the only way I'm going to get this to work is to butcher the Thor fuel rail (as that doesnt fit on the hot wire manifold) and working things that way. A night in the shed is in order me thinks!

Can anyone definitvely say that the Bosch 0 280 155 787 injectors from the Thor setup are better than the standard green collar D1830GA injectors in terms or spray pattern etc. My understanding is that the Bosch injectors create a finer mist of fuel, four small jets rather than the one big jet I seem to get from the Lucas injectors.

This is where it gets a bit fuzzy, too much time spent hungover in thermo lectures, does a finer fuel mist mean a quicker ignition and more complete burning of the fuel along the flame path, but at the risk of getting detonation sooner?

Regards
Iain

[rev-erend]

Ian

Maybe this site will help :

www.injectorsonline.com/indivprod.php?c=1

Bosch yellow top would be a pretty straight swap for 4.0 engines
and the pink tops would be the same as the old lucas 'jag' injectors both originally made by Lucas.

The Bosch are much better than a 15 year old design that's for sure.

I bought my Bosch pink tops in USA for £191 delivered :
www.fiveomotorsport.com/Injector_SetsENGLAND.asp