Im working on calculating octane requirements for my motor as it undergoes mods. One of the requirements in timing? any one know what the degree is for a 570?
Timing
- Thread starter Dieseltwitch
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OEM 570 70 degree cam? If so its 243 degrees of duration according to husaberg, web cams measured it to 238, and its 115 centerline, sort of 0.040", at 1mm lift, subtract five degrees or so for 0.025".
Inlet closing will be in the range of 50 ABDC at 1mm then, depending on data source.
I was facing the same problem recently as I was about to tune my 570. The husaberg numbers I got from the factory and the WC numbers I got from calling them. Its a very good combustion chamber and wont be prone to ping, I went with a CP 13.5 piston along with the oem cam and you cant hear it ping, it could still micro detonate the ring land true, but with similar combustion chamber Ive ran similar pressures with europe premium pump gas before(equal to US premium) and no issues, with the same closing point. Most calculation programs will freak out warning you as theyre aimed for the huge v8 market, with nothing like these pretty penthouse chambers. For the above you typically get the suggestion 110 octane, just ignore is my tip.
Inlet closing will be in the range of 50 ABDC at 1mm then, depending on data source.
I was facing the same problem recently as I was about to tune my 570. The husaberg numbers I got from the factory and the WC numbers I got from calling them. Its a very good combustion chamber and wont be prone to ping, I went with a CP 13.5 piston along with the oem cam and you cant hear it ping, it could still micro detonate the ring land true, but with similar combustion chamber Ive ran similar pressures with europe premium pump gas before(equal to US premium) and no issues, with the same closing point. Most calculation programs will freak out warning you as theyre aimed for the huge v8 market, with nothing like these pretty penthouse chambers. For the above you typically get the suggestion 110 octane, just ignore is my tip.
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Sorry was actually looking for ignition timing, but that info is still very useful!
Haha! Sorry about that 
Oh well, this is a guess as I havent tried ignition on this particular engine, but with the similar chamber I mentioned you can overshoot the optimum point ten degrees without detonation, meaning you will lose power before it will ping. Youd have to dyno it and try the optimum point out, likely its close to 35-40 degrees on high rpm wot.
Oh well, this is a guess as I havent tried ignition on this particular engine, but with the similar chamber I mentioned you can overshoot the optimum point ten degrees without detonation, meaning you will lose power before it will ping. Youd have to dyno it and try the optimum point out, likely its close to 35-40 degrees on high rpm wot.
I played with the timing on my 663cc 70 degree motor, we did not gain much more than a 1/2hp going either direction of my Vortex numbers. I do run a Vortex box so my ignition timing numbers may be slightly different that stock. Easy for me to change my ignition mapping with the Vortex ECU. We did multiple runs on the dyno FYI.
On the fueling side I have huge changes to the mapping, big gains in power with tuning and hop up there.
Spent more $$ that anyone I know tuning a 70 degree motor on the dyno $700+ in dyno time alone.
On the fueling side I have huge changes to the mapping, big gains in power with tuning and hop up there.
Spent more $$ that anyone I know tuning a 70 degree motor on the dyno $700+ in dyno time alone.
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