83V8PickUp
Member
- Posts
- 21
- Location
- N Ireland
Hi, I'll try and best explain this.
Originally on my pulley wheel there was no timing marks, except for a white line marking TDC. I bought after market tape so I could set the timing with what I hoped was a bit more precision. In the mean time the engine was fitted with new piston rings.
On my pulley wheel tape I have ATDC, TDC and BTDC. BTDC is to the right of the TDC. I've seen a lot of pictures of this.
However when I fit a timing light and connect it to number one cylinder my timing mark is way into BTDC, it will run ok with anything from 20 to 30 BTDC. That's the first strange part.
The really strange thing is that when it advances it does so to the left. I expected it to move to the right. Its the advance to the left that I find really crazy. It looks like its moving into 15 degress BTDC from 30. The engine sounds great, but I do have a very high idle. I just fitted an rpm guage that run's off coil. It's telling me i'm idleing at 1000 rpm. I believe it should be around 600. It will idle at 600 on a cold start.
Every pulley wheel that I can seen in google has BTDC to the right TDC.
Originally on my pulley wheel there was no timing marks, except for a white line marking TDC. I bought after market tape so I could set the timing with what I hoped was a bit more precision. In the mean time the engine was fitted with new piston rings.
On my pulley wheel tape I have ATDC, TDC and BTDC. BTDC is to the right of the TDC. I've seen a lot of pictures of this.
However when I fit a timing light and connect it to number one cylinder my timing mark is way into BTDC, it will run ok with anything from 20 to 30 BTDC. That's the first strange part.
The really strange thing is that when it advances it does so to the left. I expected it to move to the right. Its the advance to the left that I find really crazy. It looks like its moving into 15 degress BTDC from 30. The engine sounds great, but I do have a very high idle. I just fitted an rpm guage that run's off coil. It's telling me i'm idleing at 1000 rpm. I believe it should be around 600. It will idle at 600 on a cold start.
Every pulley wheel that I can seen in google has BTDC to the right TDC.
