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Post by racket on Jul 14, 2021 18:04:51 GMT -5
Hi Smithy
How's QLD treating you ??
Good to hear the old girl is still performing :-)
The 12/118 is sitting quietly on its trolley now that I've started work on the new engine , only room for one engine at a time on the test stand .
Stay Safe
Cheers John
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Post by smithy1 on Jul 14, 2021 18:37:08 GMT -5
Hi Smithy How's QLD treating you ?? Good to hear the old girl is still performing :-) The 12/118 is sitting quietly on its trolley now that I've started work on the new engine , only room for one engine at a time on the test stand . Stay Safe Cheers John QLD is OK....miss Sydney though. Christine doesn't much like it as all the kids and grandkids are in Sydney. Haven't had much chance to run the old girl with this Covid crap killing all the car shows etc...I have a nice new mancave built now so If you're ever up this way...be sure to drop in. Smithy.
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Post by racket on Jul 15, 2021 5:21:29 GMT -5
Hi Smithy
LOL.......yeh, not the best time to be travelling cross border , you go to Sydney to visit the grandkids and your Premier won't let you back into Qld :-(
I think we'll all have to sit tight for another 6 months before things open up , I don't mind as I'm not much of a travellor anyway .
Hopefully one day you'll get a chance to run the kart in anger on some tarmac to feel the wind in your face :-)
Cheers John
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ausjet
Veteran Member
Joined: May 2013
Posts: 133
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Post by ausjet on Aug 25, 2021 4:57:02 GMT -5
Did some testing today at a more suitable remote location. No cops were called this time. That’s a win. Takings from the day: -The bigger afterburner pump worked wonders. It now plumes clouds of unburnt fuel without ignition turned on. (Before it was a faint blue smoke) The spark plug and 500kv spark generator system lights the afterburner every time. Much more of a “kick” when it’s lit that’s for sure. - The engine has stopped flaming out on deceleration. The slightly larger 19gph nozzle/lower fuel pressure and adjustable accel/decel ramp fuel pump speed controller did the trick. - Weight distribution is shocking. I knew it wasn’t good. The front end gets loose/bounces around a fair bit when the speed gets up. Could probably move the seat forward an inch or so. Better than nothing I guess.
Issues: The oil pump isn’t producing stable pressure with hot oil. If I let it idle after startup for a minute or so it’s fine but any more than that and especially if I start throttling it up, the low oil pressure switch pulses the fuel pump relay on/off rapidly causing a loss of throttle control. (Like the switch is dancing around it’s set cutoff) You mentioned a while back John about the lack of suction baffle, it’s hard to tell if it’s sucking air even with the clear suction hose so I think it would be wise to fit one. Also on the short drive down the road I made the oil tank breather spewed out oil all over one side of the combustion chamber. The road was fairly bumpy and the breather port is only ~3” from the oil level. Oil may have sloshed over the port and pushed out by the positive pressure. Time to fab up a catch can
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Post by wannabebuilderuk on Aug 25, 2021 16:00:26 GMT -5
Could probably move the seat forward an inch or so. Better than nothing I guess. Beer belly could help with that, perfect excuse for several cases of your favourite 😁
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ausjet
Veteran Member
Joined: May 2013
Posts: 133
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Post by ausjet on Aug 25, 2021 17:25:20 GMT -5
Could probably move the seat forward an inch or so. Better than nothing I guess. Beer belly could help with that, perfect excuse for several cases of your favourite 😁 Haha can’t deny it, the ol rona virus has definitely contributed to putting on a few more kegs
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Post by wannabebuilderuk on Aug 26, 2021 2:39:47 GMT -5
Beer belly could help with that, perfect excuse for several cases of your favourite 😁 Haha can’t deny it, the ol rona virus has definitely contributed to putting on a few more kegs Natural padding, saves adding padding to the seat ha
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Post by racket on Aug 26, 2021 4:15:22 GMT -5
Hi
Do you still have the oil tank takeoff and return close to each other ??
Cheers John
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ausjet
Veteran Member
Joined: May 2013
Posts: 133
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Post by ausjet on Aug 26, 2021 7:14:43 GMT -5
Yep it’s still the same. I was thinking of cutting out the -12 turbo drain weld bung and welding a longish tube to it that sits inside the tank and reaches the other end.
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Post by racket on Aug 26, 2021 18:13:33 GMT -5
Hi
Cold oil is "sluggish" compared to hot oil , you're probably got a small quantity of oil recirculating rather your full tanks quantity , we need hot coming back at one end and cold going out the other end so as to give the oil time to de aerate
Cheers John
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Post by smithy1 on Aug 31, 2021 18:14:09 GMT -5
Issues: The oil pump isn’t producing stable pressure with hot oil. If I let it idle after startup for a minute or so it’s fine but any more than that and especially if I start throttling it up, the low oil pressure switch pulses the fuel pump relay on/off rapidly causing a loss of throttle control. (Like the switch is dancing around it’s set cutoff) You mentioned a while back John about the lack of suction baffle, it’s hard to tell if it’s sucking air even with the clear suction hose so I think it would be wise to fit one. Also on the short drive down the road I made the oil tank breather spewed out oil all over one side of the combustion chamber. The road was fairly bumpy and the breather port is only ~3” from the oil level. Oil may have sloshed over the port and pushed out by the positive pressure. Time to fab up a catch can I suspect your oil is "foaming" in the tank....hence the spillage/spewing. An aeration plate in the tank where the oil returns to tank will help greatly.....and as John has mentioned, inlet and outlet at opposite ends or as far away from each other as possible will also help with cold/hot circulation issues. A breather and catch can is well recommended too. Smithy.
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ausjet
Veteran Member
Joined: May 2013
Posts: 133
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Post by ausjet on Sept 26, 2021 5:21:50 GMT -5
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ausjet
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Joined: May 2013
Posts: 133
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Post by ausjet on Oct 10, 2021 9:26:37 GMT -5
Quite a successful day of testing. Burned through 40L of kero without much drama. The oil tank mods have sorted the issues I was having previously. The catch can works well, no more sprayed oil out the breather and all over the engine like last time. I got some decent speed up on some of the runs and apon moderate to heavy braking the engine will cut out if it’s about half way or lower of fuel in the tank. I managed to ease off the brake a few times and it was able to relight. The other times it had to be a full restart. I assume that’s due to my slim line style fuel tank design causing problems with the fuel sloshing away from the pickup. I think I underestimated the amount of baffling required. Still haven’t got solid numbers, got a bit carried away driving it. Max p2 seems to be 30psi, TOT was a bit cool at high 400s if I remember correctly. youtu.be/YAjA8zaocpI
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Post by racket on Oct 10, 2021 15:56:29 GMT -5
Yeh , you may need to add a header tank for the fuel with a low pressure pump to keep it filled .
Also be careful about your oil pressure under heavy braking .
She's looking good though :-)
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Post by pitciblackscotland on Oct 10, 2021 16:03:38 GMT -5
Nice run on the kart there mate Love the echo of the afterburner Cheers, Mark.
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