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Old 02-12-2019   #46
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Re: Engine noise at high RPM and light load

*replies to own reply*

Wiring is fine, not checked signal out but sensor is brand new so cant see that being at fault. Maybe the crank pulley is wrong for the engine, earlier one on a later engine possibly?
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Old 02-12-2019   #47
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Re: Engine noise at high RPM and light load

Never mind I was assuming the 899 used the same set up as the fire engine.

I just compared pictures of the ohv Vs ohc pulley, one is solid with a single bolt (ohv)
the other is held on by three bolts to the main timing pulley (ohc).

I can't imagine the ohv pulley is capable of going on in any other position, without the pulley or Woodruff key being damaged.

I have seen the keyway wearing on Vw engines in the past allowing the timing to go out though so not an impossibility.
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Old 04-12-2019   #48
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Re: Engine noise at high RPM and light load

May potentially have found the cause, need to add a return to tank.
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Old 04-12-2019   #49
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Re: Engine noise at high RPM and light load

Do you have your return line between the tank and pump or between the pump and engine?

A filter with an integrated return line fitted before the pump might be a good option, if it syphons back it could cause long priming times though.

I've been trying to find either a two spigot pick up/sender unit or a 1-1.2 bar in tank regulator.

Most I can find are 3 bar+, with an in tank pump and regulator you can use a single output from the tank,

the original return could be blanked off at the throttle body or used for a pressure guage fitting.

I think the hole in the robin tank could accommodate an intake pump (approx 50-55mm opening).
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Old 04-12-2019   #50
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Re: Engine noise at high RPM and light load

Could you run the return into a catch can to see if you still get the knocking
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Old 05-12-2019   #51
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Re: Engine noise at high RPM and light load

Return goes back to the pump inlet. I'll get a catch can on it and see how it goes this weekend.
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Old 26-12-2019   #52
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Re: Engine noise at high RPM and light load

Well it wasn't the fuel supply, however I've found out today that the throttle doesn't open all the way. Not enough travel from the throttle pedal. Does the IAW16F self-calibrate the throttle position?
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Old 31-12-2019   #53
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Re: Engine noise at high RPM and light load

At a wall with it now. Done ignition system, map, water temp, ECUs, fuel supply, crank sensor, throttle position sensor and now stem seals and head gasket with a decoke. All that's happened is I've used the entire Christmas holiday and got nowhere with it. It's still knocking at specific load conditions.

I would change the injector and pressure regulator but it seems to be only available as the top part of throttle body for stupid money.
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Old 18-01-2020   #54
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Re: Engine noise at high RPM and light load

Kind of a dead post now but I'll share the solution for anyone else.

Turned out to be only 0.5 bar of fuel pressure, looks like the regulator had been tweaked in the past as there was pretty much none of the wax seal left. Hooked up gauge, tweaked the screw ands knocked it up to 1.2 bar. Struggling to run properly at trhe moment as I've significantly increased the fuel flow through the injector but hopefully all will be well now.
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