Roman Posted August 21, 2020 Share Posted August 21, 2020 Pretty epic to have this all back together so quickly! Def get that rev limit up! 1 Quote Link to comment Share on other sites More sharing options...
ajg193 Posted August 21, 2020 Author Share Posted August 21, 2020 58 minutes ago, Roman said: Pretty epic to have this all back together so quickly! Def get that rev limit up! I really should sort out the oil pressure issue at some point, I don't really like how low it is getting at idle. I feel like I might have done something stupid in the reassembly, like not making sure the oil pump was butted up as far as possible in the block Quote Link to comment Share on other sites More sharing options...
Yowzer Posted August 21, 2020 Share Posted August 21, 2020 Who cares? You're not banging the limmi at idle, the engine will be completely fine. They're like the most forgiving engine ever, just thrash it and have fun. 1 Quote Link to comment Share on other sites More sharing options...
ajg193 Posted August 21, 2020 Author Share Posted August 21, 2020 My friend took it for a little hoon this evening and reckoned it's faster than his blacktop 4AGE BZ Touring /Maybe his car has missed heaps of oil changes 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted August 21, 2020 Share Posted August 21, 2020 Fair bit of weight difference too Quote Link to comment Share on other sites More sharing options...
cletus Posted August 21, 2020 Share Posted August 21, 2020 1 hour ago, ajg193 said: I really should sort out the oil pressure issue at some point, I don't really like how low it is getting at idle. I feel like I might have done something stupid in the reassembly, like not making sure the oil pump was butted up as far as possible in the block Did it do it before the rebuild ? Quote Link to comment Share on other sites More sharing options...
ajg193 Posted August 21, 2020 Author Share Posted August 21, 2020 8 hours ago, cletus said: Did it do it before the rebuild ? Nope. Oil light would go out before it would even finish cranking before Well, I guess the light goes out quickly when starting. But yeah, the light never came on when hot before. Quote Link to comment Share on other sites More sharing options...
ajg193 Posted August 21, 2020 Author Share Posted August 21, 2020 Here's an excerpt from the owners manual Quote Link to comment Share on other sites More sharing options...
cletus Posted August 21, 2020 Share Posted August 21, 2020 If you dont have a gauge on it already I'd put one on and see what it's like through the rest of the rev range before driving it too much I have had the same issue on a rebuilt engine and it was a faulty pressure switch 1 Quote Link to comment Share on other sites More sharing options...
ajg193 Posted August 21, 2020 Author Share Posted August 21, 2020 13 minutes ago, cletus said: If you dont have a gauge on it already I'd put one on and see what it's like through the rest of the rev range before driving it too much I have had the same issue on a rebuilt engine and it was a faulty pressure switch I put a gauge on yesterday, pressure built up quickly above idle It still bugs me though so I might try dropping the sump next time I do an oil change and check the pump 1 Quote Link to comment Share on other sites More sharing options...
Spencer Posted August 21, 2020 Share Posted August 21, 2020 Hmm yeah I would not be happy with a rebuilt 4k that had low pressure at idle. I have owned a couple and they had shit loads of pressure at idle they have pretty good oiling systems. But they will drop when the bottom end wears out like most things. I would spew at running anything thicker than 40w on a rebuild TBH, what were the measurements like on the bottom end? Whats the gauge say? how hot was it? A sharn for contrast, with my old Buick 455 that has a terrible oiling system designed by some barries from the 60's it started flicking the oil light. Gauge showed like 5-7psi which happens on these donks, shimmed up the oil pump (its in this gross old alloy housing that melts) and that got me a few PSI but it slowly got worse. Pulled it down and sure enough huge clearance on the bottom end, had a ghetto rebuild at some point. Fast forward throwing all the money at it and line boring the bottom end to get it back to the factory clearances which are pretty tight. Bam 40psi at idle which drops to like 25-30psi after 30min of driving once the oil was actually hot, running synthetic 30w also. You kinda needed that idle oil pressure or almost no oil was going up the pushrods to the rockers when sitting around in traffic etc. Quote Link to comment Share on other sites More sharing options...
ajg193 Posted August 21, 2020 Author Share Posted August 21, 2020 Plastigage reckoned the clearances were at the mid-upper end of allowable (old bearings were way over allowable) Gauge was saying 10 or less at idle, building up to more than 50 I think when revving up, engine was at full operating temperature and had been driving for about half an hour Light didn't come on today when doing my weekly shopping run, but the idle speed is upped to around 1000 now. Light will still come on at about 600 rpm when at full operating temperature after hooning Quote Link to comment Share on other sites More sharing options...
ajg193 Posted August 21, 2020 Author Share Posted August 21, 2020 I polished the crank with some autosol when I had it all apart, not sure if the smoother surface just lets the oil flow through faster? I still reckon the oil pump just isn't seated on the block 100%, but seeing how the pressure is fine while driving I think/hope waiting until the 1000 km oil change before pulling it apart will be fine Quote Link to comment Share on other sites More sharing options...
Spencer Posted August 22, 2020 Share Posted August 22, 2020 Pressure while driving is nothing to do with it really, pretty much everything has fine pressure off idle unless the pump has exploded. I thought the bottom end had been built. So its just a ghetto rebuild with no resizing or measuring how round it is? the low pressure will just be that pretty much. I mean I hope you find something simple like the pump bleeding pressure somewhere or whatever. But I have never had any success with new bearing shells on old bottom ends. 2 Quote Link to comment Share on other sites More sharing options...
Corbie Posted October 12, 2020 Share Posted October 12, 2020 2 minutes ago, ajg193 said: tang, desprang. Quote Link to comment Share on other sites More sharing options...
ajg193 Posted October 12, 2020 Author Share Posted October 12, 2020 In the process Quote Link to comment Share on other sites More sharing options...
cletus Posted November 17, 2020 Share Posted November 17, 2020 How's the oil pressure situation after the re rebuild? Did you find what was causing it? You must have done a heap of kms in it, I seem to remember it wasn't that long ago you replaced tyres, good work actually using your old car for its intended purpose 1 Quote Link to comment Share on other sites More sharing options...
ajg193 Posted November 17, 2020 Author Share Posted November 17, 2020 Oil pressure is better than before, crank ground undersize to 0.25, I reckon he got the clearances a little on the loose side though as it still wants slightly thicker than 15w-40, light comes on at about 550 rpm if super hot. He said the clearances were about 2.5 thou, would have been 4 if he just blindly went to book size. I'm guessing that over time there will get to be a little buildup on the bearing journals to increase the flow resistance and make higher pressure. Managed to get 35000 out of the old tyres, supposedly quite good going for a539s. It's my car of choice for driving so tends to rack up the kms 3 Quote Link to comment Share on other sites More sharing options...
CorollaGT Posted December 27, 2020 Share Posted December 27, 2020 Our race from os drag day https://www.instagram.com/p/CIuwCbxnQCG/?igshid=v11qyj100gqo 1 Quote Link to comment Share on other sites More sharing options...
ajg193 Posted December 27, 2020 Author Share Posted December 27, 2020 3 minutes ago, CorollaGT said: Our race from os drag day https://www.instagram.com/p/CIuwCbxnQCG/?igshid=v11qyj100gqo Looks like I almost kept up 1 Quote Link to comment Share on other sites More sharing options...
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