after matching the inlet manifold to the head i got a bit of a surprise
the jenvey manifold is really nice and seals with o rings, BUT doesnt suit a head with big ports, opening the manifold up to match the head has broken into the o ring grooves.
fortunatly theres just enough thickness to the mounting flange to machine the grove out.
at this point i am undecided which way to go, i could machine up a plate like a sidedraft carb has with a o ring groove in each side to carry new o rings, or simply open a gasket out a bit and use a gasket and sealant. theres not a lot of material left to seal with, but there shoudl be enough, at least on injection if it develops an air leak the worst that will happen is a bad idle, no danger of a lean mixture like it woudl get on carbs
you might of noticed my milling machine has got much much bigger, my sealey mill has been replaced with a lovely Bridgeport. many thanks to Andy pipe and crew for dealing with the scarey 3 phase electrics for me
at the moment im defiantly errring on the side of using a gasket rather than faffing around making misabs.
with that in mind i ran a fly cutter across the manifold face of the head to give a better surface to seal against, just for good measure i did the exhaust face too. nothing earth shattering, but a nice touch. its not something i usually have done, but thats simply a case of economics, when i had to subcontact it out it was hard to justify the cost
Shame about the manifold breaking out like that.
I like the Milling machine, it certainly looks good.
Those inlet ports look Huuuuge !!!!
Did that start off as an injection head then, or a carbed head?
Dont suppose it makes any difference if you're going to do that to it does it...
Last edited by rallyrob; 31-03-2018 at 21:08.
carb, because its a 1600 head
Oh ok... Have they got a smaller combustion chamber than a 2.0ltr?
Hi graham whats the size of the port entry it looks huge cheerd mario.
Last edited by Graham; 02-04-2018 at 14:08.
What's the basic advantage of using the 1600 head then Graham, is it the smaller combustion chamber?
Does a it give a more concentrated burn or something, I don't know I'm just guessing
Can you still get the same large size valves in it then? I know you you're going offsetting for larger than normal big valves.
means you dont have to skim the head to death to get compression, but also theres more material in the short turn. before the injection head came along all the really quick pintos had 1600 heads
Oh ok. I did wonder if it was also something to do with not having to skim it as much for compression...
If that's the case, maybe you need to start spending my pension for me
I'm trying to run a new Emerald K6. I did have some problems with it at the end of last year and so far I haven't had the time (more like I haven't got off my fat backside) to look at it!
How do you go about matching the inlet manifold to the head Graham? I don't know if you remember but I got one of the HT straight inlet manifolds for mine.
Cheers
Dazzle
spending money is no problem
if you order the K6 through me at work, i will give you more discount than emerald will im pretty sure you wont pay vat.
matching manifolds is done a couple of ways on Andys new one i literally bolted the manifold and head together and because the manifold was smaller and soft alloy my die grinder opened it up to match the head without making the head port bigger. normally you just match them to the gasket, so thats what i would probably do open teh head up to match an inlet gasket, you didnt have the HT manifold when yours was built so its not matched to that anyway
had a bit of a play today, trial assembly of the head shows ive gained some more inlet lift, not a lot, but an extra 10 thou is worth having, especially remembering there will be slightly more lift right through the range.
i was a bit concerned that moving the valve over may give issues with the follower wiping off teh edge of teh valve stem/ follower, but thats clearly not the case, well at least not with the newman followers im using. if i were starting agin with a fresh head i would defiantly move the valve over a bit further
Last edited by Graham; 19-05-2018 at 22:29.
What about machining the o-ring groves into the head instead of the manifold, looks like you have more room to play with there?
just caught up with all this as i have been busy building a business.
Great job you are doing graham
Straight cut dog box, clunky and noisy. Semi helical BGH type box best for a road car
As above, it is a straight cut dog box and you have to be brutal with it. also a pain in the arse having to go all the way down to get neutral. thats why i wouldn't have one in a road car.
for a track car you cant beat it and its a joy to use especially when linked up to a closed loop flat shift system
You’ve answered your own question then
Cheers
Dazzle
And here it is back in its hole
Looks Awesome, what kind of HP is expected ?
Looking good guys
I'm really interested to see how you get on with the manifold
Cheers
Dazzle
that manifold is known to add a bunch of midrange torque so we could be looking at 190+ lbft, as for power well i dont like guessing games. I have a figure in my head of whats possible given what it used to make and what improvements its had, but thats where its staying in my head, but its safe to say should go north of 220bhp. but already encouraged by flowbench results id like to start on a new head for it, just got no time, i started work 8 am yesterday and didnt leave until 10.30 pm
Last edited by Graham; 12-10-2018 at 08:24.
was the long upsweep intake manifold on dave whites engine not a success ?
Is that an SRD manifold? made a big difference on my engine.
yes
Last edited by Graham; 13-10-2018 at 08:34.
SRD's latest 92mm Pinto made 227hp on TB's with this manifold.
i wouldnt of thought so two reasons, your introducing a bend into the intake and secondly the shape of the jenvey trumpets is wrong! that might sound like a bold claim but back to back testing has shown the big wide radiused trumpets make less power than straight tubes with a simple 45 degree flare, which is probably why weber has been making them that shape for a gazillion years
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