by "Distraxi's idea of perfection is a Jagroen" (distraxi)
Published 04/27/2017 at 10:31
by "Distraxi's idea of perfection is a Jagroen" (distraxi)
Published 04/27/2017 at 10:31
Tags: rolls royce meteor
STARS: 3
...you see an engine sporting a 6-pack of 48IDAs and think “that looks a little under-carbed.”
I’m at
one of the world’s largest trade fairs
. There is lots of cool stuff. This beauty is right up there.
Totally irrelevant to what they were flogging on the stand, but it got me to stop, which is the point, I guess.
Think it’ll fit in the Toyobaru?
"BvdV - The Dutch Engineer" (dutchengineer)
04/27/2017 at 10:45, STARS: 1
Have fun at the Hannover Messe, and make sure to check out the Holland stand, there are quite some student projects and start-ups from my university (Eindhoven University of Technology) there. Not that they are as cool as a Rolls Royce Meteor though.
"RamblinRover Luxury-Yacht" (ramblininexile)
04/27/2017 at 10:47, STARS: 2
Think it’ll fit in the Toyobaru?
For a given value of “fit”, which might include replacing large portions of the suspension with SUV bits, building a custom frame, lengthening the front clip, destroying the firewall, setting the engine off center to leave even enough room for the driver, and generally making a mockery of it as anything like a feasible project.
So, yes.
"Distraxi's idea of perfection is a Jagroen" (distraxi)
04/27/2017 at 10:50, STARS: 0
Sounds good to me. Here, hold my beer...
"Party-vi" (party-vi)
04/27/2017 at 10:57, STARS: 1
Shouldn’t each barrel be pushing like 320cfm? Looks undercarb’d but it’s probably good.
"Haase" (brianhaase)
04/27/2017 at 10:57, STARS: 0
Very cool. Leno is building a custom Rolls with a similar engine setup.
"RamblinRover Luxury-Yacht" (ramblininexile)
04/27/2017 at 11:04, STARS: 1
650ish horsies at 2400RPM, so... Usually two barrels per 4.5L would be too little, but a hundred horse plus-out-of 2.25L engine doing 4800RPM, two barrel sounds more reasonable and that’s a pretty close comparison.
"TheTurbochargedSquirrel" (thatsquirrel)
04/27/2017 at 11:17, STARS: 2
You could probably fit the Toyobaru in it.
"Distraxi's idea of perfection is a Jagroen" (distraxi)
04/27/2017 at 11:30, STARS: 0
I’m don’t think the cfm figures represent reality too well in a one-barrel-per-cylinder setup, since the flow’s fluctuating all the time with valve action: it’s not like it would be if they were all feeding a common manifold.
In terms of absolute power output Meteors aren’t that hot, though as tank engines they’re presumably tuned for torque not power. 6x48IDAs is probably plenty for the original 600HP, as RamblinRover’s saying below.
But having aid that, in a crude theoretical sense 27 litres at 3000rpm (which is what a Merlin will rev to, so presumably a Meteor would too) is the same amount of air being ingested as a 13.5l motor at 6k rpm or a 9l one at 9k rpm. In other words a fair bit more suck than anything I’ve ever seen wearing Webers. So if you went to town on cams and valves, I suspect you could get to the point where the carbs were the limiting factor pretty quick. Well, limiting factor unless you count clutch, transmission, diff, tyres, driver...
"RamblinRover Luxury-Yacht" (ramblininexile)
04/27/2017 at 11:45, STARS: 0
A very good issue to raise on the single-carb-per-cylinder thing. I wonder if it wouldn’t flow better at low Rs with more inlet pairing across the manifold so that the “surge” available to one cylinder would be closer to two barrels and the flow (and mixture) would be more uniform. I bet this thing has a handicap compared to the best it could do.
"Distraxi's idea of perfection is a Jagroen" (distraxi)
04/27/2017 at 12:02, STARS: 0
I don’t think the side-to-side firing interval in a (RRAE) V12 is the same for each pair of cylinders - though I may be wrong, I’ve just spent 5 minutes staring at a firing diagram and it’s done my head in. In which case you might get some pretty uneven behaviour by connecting the barrels laterally but not fore & aft.
"RamblinRover Luxury-Yacht" (ramblininexile)
04/27/2017 at 12:14, STARS: 0
Actually, I just checked, and it IS, at least for a Merlin. Each pair has one of the two seven cylinders ahead in the order. So, air requirements almost perfectly opposite one another, and a really strong argument *in this case* to do it that way. It would be less clear if this were a Junkers Jumo or something with sequential firing order on some pairs (and sequential intake pulses) - it would be choppier.
Disregarding that, I think in broad strokes a common manifold would have worked well here. Any advantages to having a tuned intake on this sucker, with the low Rs it runs, would probably be seen by having runners like 16" long, which... isn’t happening and is no doubt *way* offset by flow irregularity.
"Distraxi's idea of perfection is a Jagroen" (distraxi)
04/27/2017 at 13:07, STARS: 1
Though if I was going to stick this sucker in a car, 16" high intake trumpets trombones would be worth having just on principle.
"RamblinRover Luxury-Yacht" (ramblininexile)
04/27/2017 at 13:43, STARS: 0
This is probably the only forum discussing optimal Weber carb intake manifold design for Rolls Royce Meteors today. Or ever, for that matter.
"Distraxi's idea of perfection is a Jagroen" (distraxi)
04/27/2017 at 17:48, STARS: 0
With the possible exception of Pistonheads. Though probably not today, statistically speaking.
"Rusty Vandura - www.tinyurl.com/keepoppo" (rustyvandura)
05/12/2017 at 06:02, STARS: 0
And some other schlub reading it.