Crane HI-6M knock sensor
10-10-2005, 07:37 AM
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Crane HI-6M knock sensor
Looking at switching from a MSD ignition to a Crane HI-6M. Has anyone used the knock sensor option with the Crane box? Which sensor did you use and where was it mounted? Gen IV, Gen V, GenVI Block?
10-11-2005, 07:39 AM
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Re: Crane HI-6M knock sensor
Have another question. Currently using T-Bolt IV with MSD 6M and V6-14 module. Running 30 degrees total on 454 with B&M 250's and 741 cam. I get a 300 rpm drop from out of gear to in gear. Will going to a fixed 30 degrees timing help this out? I cuurently idle at 950 out and 650 in. What are others seeing as for RPM in-out of gear drop?
10-11-2005, 07:59 AM
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Re: Crane HI-6M knock sensor
What cam are you using? If it is large enough to bleed off some cylinder pressure below 3000 rpm, try it. I would be careful about detonation under acceleration. My rpm drop is about the same but I try to keep my idle below 900 rpm to save the drives. I have to throttle each time I shift to keep the rpm's up.
10-11-2005, 06:24 PM
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Re: Crane HI-6M knock sensor
Cam is Crane 741 hyd roller. The total 30 degrees is in by 1700 rpm with the V6-14 module. The timing starts to advance around 800rpm with the V6 module.
10-12-2005, 05:30 AM
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Re: Crane HI-6M knock sensor
I purchased the same crane boxes - Cranes support and automatic retard boxes advertized can not be found and crane is no help. I have used the boxes for 2 years - paid the money ran them on a dyno to prove knock window/ tested fuels etc - 509's w/ 250 blower 5 lbs boost - 653 hp @ 5300 rpm
10-12-2005, 05:52 AM
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Re: Crane HI-6M knock sensor
If you go with lock in timiing you should be able to lower you idle out of gear & still have the same idle in gear. With the load of the prop & your timing retarding is the reason you are having to go to such a high idle rpm.
10-12-2005, 06:26 AM
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Re: Crane HI-6M knock sensor
Yes, with a cam that large, I'd lock the timing. It should improve your idle.I had a problem with starters though after I locked mine. On my 540's the small gear drive starters would break if the engines kicked back. Went through 8 starters summer before last. This summer I installed Tilton starters and MSD start retard boxes that retard up to 20 degrees only at startup. No problems this year at all.
