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So true, there are jst so many aspects to inlet manifold tuning. Sounds like the 4.7uz had a fair wack of overlap on the cam if it needed a bridge port between the two banks!
But, in my case anyway (with single port lpg) the tuning of the snorkel will have very little effect on what happens on the other side of the throttle plate.
You're really talking about chasing differences that you only see in CFD rather than something that is tangibly noticeable. As for overlap, with over 5mm added to the nose height alone before changing the profile you cold say there was some overlap to make it breathe at the required RPM's.
Cut the hole in the inner wing yesterday. I definitely think land rover didn't want their p38 to have a snorkel. Their designs conspire against it. Before and after shots.
Made myself a hot tub time machine today to help me make the snorkel.
Not really. I made a hot wire cutter using nichrome wire and a battery charger as the power source. This is going to cut the extruded polystyrene that I've acquired to make a positive mould for the fibreglass that I will use to join the two halves of the LDPE patrol gu snorkel that I'm bastardising.
I've fitted the upper section to the A pillar. I'm close to having the bottom section attached to the wing. Then for the playing about with polystyrene for the middle section that will skillfully curve around the bonnet. Should be fun. Bringing out my artistic side! The things ya get up to with a P38 hey. Life would be dull without Nora.
I'll post some pictures to show what I'm on about in due course.
Next stage complete. Now for the creative part. Unless you think it'll do like that!
Mmmm,
How's this, block each of the upper and lower holes approx 50mm in, tie a plastic bag around the two ends encompassing vacant area you trying to fill. Open the bonnet to attain the shape of the inner curve and fill the bag with expanding foam, allow to set and carve away the excess.
Smooth the finished negative ( adding appropriate marketing name of course), then cast a positive off this. Once you have got this far you can start casting money in fibreglass snorkels:p:p
Good luck!
Rob
Looking great mate! Hope you keep the mould! Could be in the market very soon. Just picked up some more bits for my underbonnet routing today! Must say i like where you're heading on outer side though[thumbsupbig]:Quote:
Originally Posted by davidsonsm
Looking great there! Can't wait to see the finished product!
One thing to keep in mind is the bonnet opening angle, this will effect the shape of the snorkel in that area.
The carved extruded polystyrene positive mould will have to be smashed/melted. As it will be encapsulated within the fibre glass. But assuming the thing turns out half decent, I'd be willing to submit the finished snorkel to a plastic moulding place in Melbourne for them to copy. And then it'd be a matter of how many would be needed to make them economical. I'm sure they could refine the design. Let's see how it turns out and whether it looks like polished turd, or like safari made it..
If you could design the connection pipe work to be removable or slide over and up the top section of pipe then the mould could hug the bonnet and look great. Then remove that section when you need to open the bonnet.
Not sure how good the sealing would be and if it's worth the hassle but just putting it out there.
Like as if a P38 bonnet needs to be opened very often lol.