Adjusting Crane rockers when running- best method?
11-10-2005, 06:46 AM
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Adjusting Crane rockers when running- best method? Is adjusting the rockers when running the most reliable way of setting the lifter pre-load?
If so....how do you go about it? Does anyone have experience.
I'm just not convinced with the existing method with all the variables in the valve train. Yes, I'm looking for no loss in compression and also minimal valve train noise.
Thanks, Tom.
If so....how do you go about it? Does anyone have experience.
I'm just not convinced with the existing method with all the variables in the valve train. Yes, I'm looking for no loss in compression and also minimal valve train noise.
Thanks, Tom.
11-10-2005, 02:46 PM
#3
Go to Vinci's web site ----->>>>>
Follow the instructions to a "T" and you will have no problems. If you don't understand post your question and someone who has done them can answer. The adjustment with the engine off if very simple, but time consuming. Make sure you get zero lash correct, that is the first step. Then I marked my adjusting nuts at the 12 o'clock position with a dab of white paint so I could count 1/4 turns and followed their adjustment. Very simple, valve train is a quiet as stock. Don't do it with it running, bad idea.
Follow the instructions to a "T" and you will have no problems. If you don't understand post your question and someone who has done them can answer. The adjustment with the engine off if very simple, but time consuming. Make sure you get zero lash correct, that is the first step. Then I marked my adjusting nuts at the 12 o'clock position with a dab of white paint so I could count 1/4 turns and followed their adjustment. Very simple, valve train is a quiet as stock. Don't do it with it running, bad idea.
11-10-2005, 07:06 PM
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Most after market springs have seat pressures of 130-140 lbs, even Cranes have 112 lbs. VHP install instructions indicate maximum of 70lbs seat pressure, please explain.
11-11-2005, 05:03 AM
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Originally Posted by bigdsz
Most after market springs have seat pressures of 130-140 lbs, even Cranes have 112 lbs. VHP install instructions indicate maximum of 70lbs seat pressure, please explain.
So the lifter is likely to compress more with the stiffer springs, making the 1 +3/4 turns less reliable.
I think I will have to search into this further.
Thanks.
11-11-2005, 06:27 AM
#7
No no no, the 70 lbs. is the stock pressure. They tell you this as this lower pressure dictates the amount of time between quarter turns. What they are telling you is that the low spring pressure takes some time to bleed down the lifters. The reason is if you go too fast with the procedure you run the risk if tightening the valve into the piston if that particular piston is too close. The lifter compression is solely dictated by the turns of the nut, not the spring pressure. It is a simple lever with a spring on one end.
If you follow the procedure you will come out fine, second guess it at your own peril as there have been 100's of guys who have used it successfully, the only ones who have had a problem were the ones that did not.
If you follow the procedure you will come out fine, second guess it at your own peril as there have been 100's of guys who have used it successfully, the only ones who have had a problem were the ones that did not.
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11-11-2005, 07:16 AM
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Thanks 'nutts.
Just to give the whole picture. I have adjusted exactly as on the Vinci website.
I was just wondering whether with the inconsistencies in the stock lifters would mean that the standard procedure was leaving hp on the table.
Also wouldn't higher pressure springs tend to compress the lifter plunger more before the valve starts to move, compared to a lighter spring effectively reducing the max lift at the valve?
Or am I misunderstanding the mechanics of the Hyd. Roll. lifter?
Thanks for the input.
Tom.
Just to give the whole picture. I have adjusted exactly as on the Vinci website.
I was just wondering whether with the inconsistencies in the stock lifters would mean that the standard procedure was leaving hp on the table.
Also wouldn't higher pressure springs tend to compress the lifter plunger more before the valve starts to move, compared to a lighter spring effectively reducing the max lift at the valve?
Or am I misunderstanding the mechanics of the Hyd. Roll. lifter?
Thanks for the input.
Tom.
11-11-2005, 04:43 PM
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Originally Posted by bigdsz
Most after market springs have seat pressures of 130-140 lbs, even Cranes have 112 lbs. VHP install instructions indicate maximum of 70lbs seat pressure, please explain.
maybe what's in bold is why.