The V8 Owners Forum -

katanaman wrote:as for fuel rails getting too hot why not insulate them and stop them getting hot in the first place.

Marki, I've thought a lot about this and as mentioned in my SD1 "hot start" essay, it might be couterproductive.

Because the latent heat in the engine will alway rise due to convection at very slow speeds or when staionary, eventually everything will reach the highest temperatures irrespective of insulation.

Then just when it needs to cool down quickly, it cant because the insulation keeps the heat in. The words "hoist" and "petard" come to mind.

It might not help too much in the hot start scenario because like you say it will eventually heat soak anyway, but it will work for the hot running problems that Ian is having. The constant fuel flow will remove the heat before it ever builds up and as there will be less heat anyway (because of insulation) the returned fuel should be much cooler. Over all I think it would be worthwhile for Ian to do it. One way to find out for sure and thats for someone to try it lol. Over to you Ian

Guys

Thanks for the assistance -Ramon it was a fairly easy thing to check the fuel filter and with that much crap in it - it must have been reducing fuel flow. (Pumps also seem to be running quieter now so I think this was certainly not helping)

Lagging - yes a good idea and likewise coating the rear bulkhead with heat mat should reduce cabin temps

Ian

Have a look at my Avtar

This is a pic of the rear of the GT40
The 9 hole stainless panel is about 1 inch above the 4 into 1 collectors on the exhaust.

In front of that is a perspex rear window
Under the window would normally sit 4 IDA webbers sucking air that comes in from 2 scoops on either side

Look carefully and you can see the head of the plenum chamber of the RV8.

The normal Vac Advance take off was sealed as the "bonnet" sits about 1/4 inch above the air inlet bit of the plenum

The top of Rocker covers are thus about 3 inches below the "bonnet"

The Header pipes curl around the rear of the rockers so again muchos heat source

The whole of the underside of the body is heat matted in silver reflective stuff

So when moving there is some cool air that will blow on and around the plenum and fuel rail (The stuff designed to go through the original carb set uo) but other than that it's cooking!


Ian

Ian Anderson wrote:Have a look at my Avtar

This is a pic of the rear of the GT40
The 9 hole stainless panel is about 1 inch above the 4 into 1 collectors on the exhaust.

In front of that is a perspex rear window
Under the window would normally sit 4 IDA webbers sucking air that comes in from 2 scoops on either side

Look carefully and you can see the head of the plenum chamber of the RV8.

The normal Vac Advance take off was sealed as the "bonnet" sits about 1/4 inch above the air inlet bit of the plenum

The top of Rocker covers are thus about 3 inches below the "bonnet"

The Header pipes curl around the rear of the rockers so again muchos heat source

The whole of the underside of the body is heat matted in silver reflective stuff

So when moving there is some cool air that will blow on and around the plenum and fuel rail (The stuff designed to go through the original carb set uo) but other than that it's cooking!


Ian

My Morris has a single big (14"?) Kenlowe fan on the front, and an electric water pump, no mech fan or pump, and it'll happily sit in hot steamy traffic for ages with both fan and pump running, with no signs of flatness of the battery. I can cruise round town for ages, again with both running, and no problem. I can't 't see why you shouldn't be able to adapt a small fan to ventilate your engine bay a little. It could sit below the plexi panel, sucking air through the scoops you mention.