tazzanz Donating Members 573 Member For: 9y 4m 27d Gender: Male Location: NZ Posted 18/02/19 08:04 AM Author Share Posted 18/02/19 08:04 AM I will probably just see when the power curve ends, if its still making power at 7000-8000rpm with the GT47 I will let it eat. Obviously if its not making anymore power past 6500 its unnecessary. I was in contact with Nitto last week to purchase some ARP625 rod bolts, they said it would be a waste unless I'm seeing 10000rpm, Im currently running ARP2000 Bolts with a "0.250" gudgeon pin. I will relay the above to my head guy when the time comes, The oil pump should be more than capable supplying oil at these rev's same pump has seen 10000rpm on the dynomite car. Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 17y 2m 2d Gender: Male Location: Perth Posted 18/02/19 09:47 AM Share Posted 18/02/19 09:47 AM (edited) That's rubbish. Stock 6 tops. Runs out of power with stock cams unless big boost. . . But once built with performance Parts +7500 ok. Edited 18/02/19 09:55 AM by arronm 1 Link to comment Share on other sites More sharing options...
MBAF Bronze Donating Members 2,156 Member For: 8y 4m 14d Posted 18/02/19 10:10 AM Share Posted 18/02/19 10:10 AM just send the carnt! Link to comment Share on other sites More sharing options...
eff xr6t Member 569 Member For: 11y 2m 29d Posted 18/02/19 12:13 PM Share Posted 18/02/19 12:13 PM Plenty of chevs and ls motors with 100mm stroker cranks still seeing 7000+rpm, I see the 5500rpm as a waste of time building a motor if that’s as far as it can rev. 1 Link to comment Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 15,996 Member For: 9y 11m Gender: Male Location: South Australia Posted 18/02/19 12:45 PM Share Posted 18/02/19 12:45 PM Spin a stock barra to 7k and you will break it in a short amount of time. Not the case with upgraded internals. The piston speed etc is a consideration when picking a rev limit regardless of how well it's built. Link to comment Share on other sites More sharing options...
arronm Dropping a turd Gold Donating Members 9,520 Member For: 17y 2m 2d Gender: Male Location: Perth Posted 18/02/19 12:54 PM Share Posted 18/02/19 12:54 PM Forged steel crank helps. Link to comment Share on other sites More sharing options...
eff xr6t Member 569 Member For: 11y 2m 29d Posted 18/02/19 01:05 PM Share Posted 18/02/19 01:05 PM We’ve spun a mates dead stock ba na motor to 7500 with stock everything and a gt42 on the side doing skids for over a minute at full noise and still haven’t had it go rods out My stock 4l did 7200+ for years on 25lb crank ended up breaking but highly doubt Rpm was the cause of that being that everything else in the motor is still in perfect condition. Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,068 Member For: 16y 8m 19d Gender: Male Location: Melbourne Posted 18/02/19 01:06 PM Share Posted 18/02/19 01:06 PM is that good luck or good management? Link to comment Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 15,996 Member For: 9y 11m Gender: Male Location: South Australia Posted 18/02/19 01:09 PM Share Posted 18/02/19 01:09 PM (edited) Lol that's mainly luck combined with a decent tune. I bet those rods weren't far off bending if they weren't already a bit buckled. Edit: It's also luck to get a na motor to spin that high under boost. The valve springs would not have been very happy if they were even closing the valves in time. Edited 18/02/19 01:12 PM by Puffwagon Boost Link to comment Share on other sites More sharing options...
eff xr6t Member 569 Member For: 11y 2m 29d Posted 18/02/19 01:11 PM Share Posted 18/02/19 01:11 PM IMO luck definitely was helping that one a lot haha 1 Link to comment Share on other sites More sharing options...
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