does anyone have a gen iv shortblock handy??
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 311
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From: Omaha,Ne
does anyone have a gen iv shortblock handy?? I need to verify a tooth count.
Can someone with a 58 tooth crankshaft, verify this,
With cyl. #1 at TDC, look inside the hole that the crank sensor goes in.
Then turn the engine in reverse rotation, counting the teeth until the missing teeth come up.
I think it should be 14 teeth from TDC to the missing teeth.
Thanks,
I know it is a little confusing, so if there are any questions, post them up.
Can someone with a 58 tooth crankshaft, verify this,
With cyl. #1 at TDC, look inside the hole that the crank sensor goes in.
Then turn the engine in reverse rotation, counting the teeth until the missing teeth come up.
I think it should be 14 teeth from TDC to the missing teeth.
Thanks,
I know it is a little confusing, so if there are any questions, post them up.
Last edited by atomic 6; Feb 4, 2013 at 03:04 PM.
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 311
Likes: 3
From: Omaha,Ne
I need the offset(in degrees) that the missing teeth are from the tooth that is seen when the engine is at TDC on cyl 1.
If this was at TDC then I need the number of teeth that go by till you see the missing tooth gap in the 58x wheel. It should be 14, but I need to be sure, and I don't have a gen iv engine here right now.
That tooth number, times the 6 degrees per tooth (360/60)will give me the offset I need for phasing the correct time to spark each cyl.
If this was at TDC then I need the number of teeth that go by till you see the missing tooth gap in the 58x wheel. It should be 14, but I need to be sure, and I don't have a gen iv engine here right now.
That tooth number, times the 6 degrees per tooth (360/60)will give me the offset I need for phasing the correct time to spark each cyl.
John Here is a shot of mine, I have the heads on and did the best I could to locate tdc. I marked tdc with a marker as you can see, which also looks to corespond with a small round hole. If you are counting teeth past the gap at tdc, there are 13 teeth sticking out before the missing teeth.
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 311
Likes: 3
From: Omaha,Ne
John Here is a shot of mine, I have the heads on and did the best I could to locate tdc. I marked tdc with a marker as you can see, which also looks to corespond with a small round hole. If you are counting teeth past the gap at tdc, there are 13 teeth sticking out before the missing teeth.
So, it is either 13 or 14 teeth, I think it is 14 because we have to trigger off of the falling edge of the tooth, and I think we will see the falling edge of the previous tooth(tooth 14) at TDC.
So at 78 or 84 degrees(84 more likely) we can program the Microsquirt to trigger correctly.
I have put together a tune and am going to send it to someone looking for one.(probably acouple people now) The tune part was easy, but the setting up the trigger wheel is alittle complex.
Thanks for the help.
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 311
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From: Omaha,Ne
Two of the holes in the reluctor wheel that look like they have arrows in them are used to align with two of the flywheel bolt holes.
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Brett Foote Thread Starter
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Joined: May 2006
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From: Omaha,Ne
I will post up in here the outcome of this whole process. Once we get this correct everybody else will be able to just use these standard settings for a GEN 4, just like the settings I gave to Denmah for the GEN 3.
