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Aussie Gremlin |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5787 |
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Posted: Sep/30/2018 at 8:52pm |
Time to kick of the new season with the Aussie 360 powered Gremlin
It's no longer stock, never really was in hindsight, so I think a new thread is in order. Here is the old thread for reference: http://theamcforum.com/forum/stock-360-output_topic91270.html This is a wrap of what we achieved last season: 29/11/17 first night out with 265/50/14 street tires: Best time 16.23 @ 87.9 mph, best 60' 2.69 06/12/17 swapped out the street tires for the 26" x 10" slicks, didn't really need the extra traction but the T/As were old and cracked so I'd been told not to come back with them on the car. Also lost the front bumper for a 72 lb. weight saving. Best time 16.07 @ 91.2 mph, best 60' 2.68 20/12/17 advanced ignition timing from 5 deg initial to 15 deg initial, amazing how much difference a little bit of extra timing makes. Best time 15.00, best mph 93.8, best 60' 2.30 3/01/18 didn't want to waste time messing with the 600 vacuum secondary Holley carb that was never going to be a long term solution, so installed a Holley Sniper with 1" open spacer on the Performer intake over Christmas Best time 14.42 @ 95.9 mph, best 60' 2.24 31/01/18 replaced the rear main seal, not really a performance improvement, but better than leaking oil all over the place. The previous weeks Sniper data logs had also shown that I wasn't getting full throttle, so I fixed that Best time 14.24 @ 98.0 mph, best 60' 2.25 14/02/18 installed electric fans, this fixed the overheating issue I'd been having with the old factory flex fan Best time 14.12, best mph 98.1, best 60' 2.15 28/02/18 installed a CRT reverse pattern manual valve body, did struggle with gear selection that night, but managed one clean run Best time 14.00 @ 98.1 mph, best 60' 2.13 7/03/18 the previous week had identified some problems with axle windup (driveshaft was hitting the floor), so added some homemade slapper bars, which fixed that and also modified the shifter to fix the gear selection issues Best time 13.98 @ 98.4 mph, best 60' 2.14 9/05/18 the engine had always had a fair bit of lifter noise so on further investigation it was found that one of the exhaust lobes and the corresponding lifter had failed. Installed a new bigger and badder cam, but only got one run before the starter motor died Best time 14.60 @ 98.0 mph, best 60' 2.48 16/05/18 back with another starter, but it became pretty obvious that the new cam wasn't helping things, probably way too big given the relatively low compression of the otherwise stock engine and lack of a decent high stall torque convertor Best time 14.37 @ 98.7 mph, best 60' 2.36 26/05/18 thought I would try to be smart and advance the cam 8 degrees, didn't really help Best time 14.59 best mph 96.5, best 60' 2.30 Made a total of 62 runs over the season and did make some good gains before the slicks were packed away for the winter break. |
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I've finally given up drinking for good...........now I only drink for evil.
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5787 |
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So over the winter break, the engine has been out for a freshen up, full detail here:
http://theamcforum.com/forum/360-shenanigans_topic94523_page6.html Basically what's been done is: Installed 343 style flat top pistons increasing compression to around 10.5:1 Balanced rotating assembly Home ported cylinder heads Torker intake to replace the old Performer Electric water pump Upgrade to 120 Amp one wire alternator Machine early style 71 crank to Torqueflite specs Installed a Turbo Action 10" S-800 converter, should be around 3500 stall Back together and ready to run: Hope to run it down the strip this Wednesday night weather permitting, will be very interesting to find out if all of that work has been worthwhile. Edit: Still running the larger cam from last season, now installed at 105 ICL with the new timing set and measured as follows: Intake: Open 36 BTDC, Close 82 ABDC, Duration 298 0.050", 11 BTDC, 41 ABDC, Duration 232 Intake center line 105 Valve Lift 0.510" Exhaust Open 77 BBDC Close 45 ATDC, Duration 302 0.050", 52 BBDC, 6 ATDC, Duration 238 Exhaust center line 106 Valve lift 0.510" LSA 110 Exhaust it still choked through factory free flows and small bore 2" dual exhaust. Any predictions? Edited by WesternRed - Sep/30/2018 at 10:33pm |
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I've finally given up drinking for good...........now I only drink for evil.
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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I think a smaller cam or at least another point of compression would help
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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steinercj5
AMC Apprentice Joined: Jul/29/2016 Location: Kenosha Wi Status: Offline Points: 144 |
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I predict you pass right over the 13's and are now in the 12's. I had a very similar setup in a '66 American and it was mid 12's consistently. Good air and different elevation made a 12.26.
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5787 |
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Not in the 12's just yet, had the rain come in last night, so only got 4 runs in before they called it off. The first run off the trailer was the best run of the night, isn't it always, 13.52 @ 101.76:
Had a buddy there as well: I reckon he was a bit rusty, so managed to catch him napping at the lights: Pretty happy so far although I was probably hoping for a bit more, still need to work on the 60' times, I've picked up about 3/10 there over last time out, but less than 1/10 over what it did with the smaller cam. Bit more practice there will probably help. Also seems to be lacking a bit in the top end and I'm wondering if the pea shooter exhaust is holding it back. Currently has dual 2" pipes with some unknown old mufflers on it, maybe some gains to be found there without the need for headers.
Edited by WesternRed - Oct/03/2018 at 5:50pm |
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I've finally given up drinking for good...........now I only drink for evil.
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5787 |
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I had a good read back over the old thread and as usual there's still a few basics I need to go back over.
First one is timing, I set it up initially with 30 deg total advance, I suspect it will need a bit more? In my defence, the 4 runs last night were all made within about 30 minutes before the rain set in, so I didn't really have time to make any adjustments. Any thoughts on what the maximum safe timing would be with the new setup, I wouldn't trust myself to detect any pinging under race conditions? Couple of degrees at a time I guess and see what happens with the mph and times. Not really sure what's the best approach to using the new convertor, seems like it flashes to around 3500 RPM, what sort of RPM should I be aiming to hold on the line? I'm trying to gauge how much of an issue the exhaust might be, ET/MPH suggest around 250 HP, not sure how accurate this is http://www.exhaustvideos.com/faq/how-to-calculate-muffler-size-pipe-diameter/, seems to suggest that I am approaching the limits of dual 2" pipes without even allowing for mufflers. Interested to know how much HP the factory free flows (2.25" outlet) will support, to know if I would be wasting my time putting some bigger pipes on it for now. I know I really need some headers for it, but trying to hold off on that. |
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I've finally given up drinking for good...........now I only drink for evil.
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steinercj5
AMC Apprentice Joined: Jul/29/2016 Location: Kenosha Wi Status: Offline Points: 144 |
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I found my 3500 stall converter to not really be enough. When I got up on the converter before launch (about 1700 rpm- any more pushed me through the beams) it would leave the line a bit lazy- until I got to 3000. The car definitely did better when I stabbed from idle but still needed more stall. I'd try both ways and see what your best 60' is.
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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34* total timing should be good
2" exhaust is small
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5787 |
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Had an interesting discovery under the front seat, found a missing time sheet from back in May, the car actually ran 102.92 mph which is actually a fraction faster that it did with the fresh engine last week. Pretty much suggests that while the new converter is getting it off the line a lot quicker and producing better elapsed times, it's not really making anymore power. I'd temper this with the fact that I haven't played with the timing yet.
In the meantime, I had a dig around in the back of the shed and found this: The headers have had a hard life as well as being pretty old and crusty: Now I've seen the Engine Masters header bash episode, but I still wasn't going to stand for that, so did a bit of straightening: Gave them the once over with the wire wheel and hit them with a bit of rust converter, just need to install them now. |
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I've finally given up drinking for good...........now I only drink for evil.
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5787 |
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Anyway, off with some dirty old exhaust bits: And back on with some other dirty old stuff: There is no way the other bit of exhaust will fit these headers easily, so it looks like starting from scratch is going to be the best option.
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I've finally given up drinking for good...........now I only drink for evil.
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