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Post by Datsunreal on Aug 24, 2009 11:47:08 GMT 10
Have you thought of using the N42 head on the L24 block? should reduce your compression and you get 44mm intakes as well.
im sending my N47 off this week for a reco and 44mm inlet valves, should give me about 9.6:1 on the engine calculator with flattops.
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Post by scando on Aug 24, 2009 12:41:32 GMT 10
I agree, if those exhaust liners are designed to get hot it's definately not what you want. The hotter the exahust temp, the hotter the turbo. The hotter the turbo, the hotter your inlet temp. Are you running an intercooler?
I run mine on avgas, it's great stuff. A bit hard to come by now though. I've got a department of environment logbook issued through cams so that I can use it.
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Post by ricecutter on Aug 24, 2009 16:36:49 GMT 10
Great conversation guys, sorry to throw in but of some concerns are knock sensors which unless I'm wrong have only any application on the rolling road as on road or track vibration and bumps tend to muck them about.
I struggle with high compression,timing and fuels with my NA L20, but now have tried (fried) a few variations. How many heads ARE there out there, I was offered a Brookfield not so long ago....
A Rule for fuel: Better rich than poor
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Post by scando on Aug 25, 2009 12:24:00 GMT 10
I believe the ear-muff style ones are the way to go. So you can actually hear what's going on and decifer between rattles and actual detonation. Having said that, I know Andrew Lawson runs a knock sensor on the steering wheel of his 200SX and he's not the kind of guy to use something if it doesn't work  Probably one of those things that you get what you pay for. I have no idea what they cost. |
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Post by noddle on Aug 26, 2009 18:53:23 GMT 10
I agree, if those exhaust liners are designed to get hot it's definately not what you want. The hotter the exahust temp, the hotter the turbo. The hotter the turbo, the hotter your inlet temp. Are you running an intercooler? I run this intercooler, temps are about 26-28C normal driving, and about 36C after a few 1st, 2nd, 3rd pulls. Nigel Attachments:
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Post by scando on Aug 26, 2009 21:40:35 GMT 10
That's a good design. It's hard to come up with something for a non-crossflow engine. Mine has a nasty crossover pipe running from the turbo across the front of the engine to the other end of the intercooler. I can't remember what my intake temps were on the dyno but 36C sounds quite reasonable.
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Post by noddle on Aug 31, 2009 18:39:30 GMT 10
Hi, the weather cleared up for a few hours on sunday, so I pulled it down for a look, It looks like it's been detonating for awhile,    but it give me a change to fit my EGT probe  Nigel |
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Post by scando on Sept 1, 2009 12:55:16 GMT 10
At least the pistons still look ok so that's a bonus. What brand of head gasket was that? I think the gaskets I've been running lately are Duropro or something like that? Only cheap but work well. I tried a graphite gasket at one stage but couldn't get it to clamp down properly.
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Post by Datsunreal on Sept 3, 2009 7:49:33 GMT 10
mmm thats blown good! is that a valve kiss on the edge of the cylinder?  i hope not, thought about eyebrowing the block while the heads off, my block has a notch machined on that spot for the intake valve which i think is factory, helps with breathing as well as added space for the edge of the valve. |
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Post by noddle on Sept 3, 2009 9:17:08 GMT 10
mmm thats blown good! is that a valve kiss on the edge of the cylinder? i hope not, thought about eyebrowing the block while the heads off, my block has a notch machined on that spot for the intake valve which i think is factory, helps with breathing as well as added space for the edge of the valve. good eye, yes it has, I though about grinding it a little when I had the head off, but with the crappy weather, I wanted to get it going again. I'm in the process of building a bottle press, and once that's done, I'll build up another engine, (I want the press so I can press the valve guides when I do the head work). I still haven't decided if it will be a L28 or a L24, I have one of each engines, the L24 has dished pistons, but I don't know about the L28, till I pull it down, I'm wanting to do this on the cheap, so it will need dished pistons already, I'll be do bearing, rings, seals, head work and arp head bolts. Nigel |
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Post by noddle on Sept 5, 2009 15:25:59 GMT 10
Hi, Got it back together, and it's going very nicely, my EGT works very nice, and super responsive.   made a large change on my spark table, too what it was when I blew the head gasket, so hopefully I shouldn't do another one. Before  After  Nigel |
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Post by scando on Sept 8, 2009 21:45:34 GMT 10
That looks more like it. Happy motoring  |
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i hope not, thought about eyebrowing the block while the heads off, my block has a notch machined on that spot for the intake valve which i think is factory, helps with breathing as well as added space for the edge of the valve.