A customer asked me a strange question ENGINE Related
#779558
08/21/10 01:49 PM
08/21/10 01:49 PM
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Joined: Mar 2007
Posts: 12,013
Finally a HUSKER again
Moparnut426
OP
I Live Here
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OP
I Live Here
Joined: Mar 2007
Posts: 12,013
Finally a HUSKER again
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So this customer of mine just got done building him a 406 chevy, and Its in the car, but he wants to pre lube it and dosnt have the tool to do that so he is gonna use the starter to spinn over the engine. No biggie, but here is the kicker. His headers are on, and a royal pain in the butt to remove plugs, so he is gonna leave them in there, no biggie again, then he tells me the rocker arms arent in the engine yet, as they arent shipped from his vender yet. SOOOO, he asked me if it will hurt the thing to spinn it over without rockers in it, and not pull the plugs. 11 to 1 motor, and a flat cam. I told him to be carefull not to pop any lifters out, and pull push rods, but I couldnt answer him on the engine being hurt rolling over without valves opening or closing. He is conserned about bending a rod from the compression not going anywhere. Will it vacume lock the engine?
I told him to wait till his rockers show up. But its kinda interesting to me.
Kasey
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Re: A customer asked me a strange question ENGINE Related
[Re: Moparnut426]
#779559
08/21/10 02:00 PM
08/21/10 02:00 PM
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Joined: Oct 2004
Posts: 354
Livonia Michigan
440dart
enthusiast
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enthusiast
Joined: Oct 2004
Posts: 354
Livonia Michigan
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Quote:
So this customer of mine just got done building him a 406 chevy, and Its in the car, but he wants to pre lube it and dosnt have the tool to do that so he is gonna use the starter to spinn over the engine. No biggie, but here is the kicker. His headers are on, and a royal pain in the butt to remove plugs, so he is gonna leave them in there, no biggie again, then he tells me the rocker arms arent in the engine yet, as they arent shipped from his vender yet. SOOOO, he asked me if it will hurt the thing to spinn it over without rockers in it, and not pull the plugs. 11 to 1 motor, and a flat cam. I told him to be carefull not to pop any lifters out, and pull push rods, but I couldnt answer him on the engine being hurt rolling over without valves opening or closing. He is conserned about bending a rod from the compression not going anywhere. Will it vacume lock the engine?
I told him to wait till his rockers show up. But its kinda interesting to me.
Kasey
I would not! prime my motor with the starter, sounds like a disaster waiting to happen, It's Chevy so who cares. 
Yes I live in Michigan, so there is still 1 light on
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Re: A customer asked me a strange question ENGINE Related
[Re: 440dart]
#779560
08/21/10 02:07 PM
08/21/10 02:07 PM
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Joined: Jan 2003
Posts: 19,382
Las Vegas
Al_Alguire
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 19,382
Las Vegas
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Just tell him to find a junk distributor. Remove the gear off of the shaft and cut the advance mechanism off the top and attach a drill and use it. Pretty simple deal, or buy the priming tool from Summit, but has to be easy to find a SBC dist to cut up. I have had one like that for years for the Chebbie stuff I do.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: A customer asked me a strange question ENGINE Related
[Re: Al_Alguire]
#779561
08/21/10 02:19 PM
08/21/10 02:19 PM
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Joined: Aug 2007
Posts: 81
Charlotte NC
cudadave72
member
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member
Joined: Aug 2007
Posts: 81
Charlotte NC
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Quote:
Just tell him to find a junk distributor. Remove the gear off of the shaft and cut the advance mechanism off the top and attach a drill and use it. Pretty simple deal, or buy the priming tool from Summit, but has to be easy to find a SBC dist to cut up. I have had one like that for years for the Chebbie stuff I do.
Exactly 
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Re: A customer asked me a strange question ENGINE Related
[Re: B1Fish540]
#779563
08/21/10 11:06 PM
08/21/10 11:06 PM
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Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
bigtimeauto
Trophy Winner
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Trophy Winner
Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
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No fear. With the plugs in and no rockers the starter is going to burn up before it cranks over!
No matter what it should not be primed by cranking it over or without the pushrods and rockers on. On GM the oil for the rockers comes from the lifters/pushrods. get a primer or like someone posted, get a old distributer and make one.
BB, TT5,Procharged 3300lb Street Car 4.79/154
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Re: A customer asked me a strange question ENGINE Related
[Re: bigtimeauto]
#779566
08/22/10 01:32 PM
08/22/10 01:32 PM
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Joined: Oct 2007
Posts: 4,210
New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,210
New York
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Valves closed: intake stroke makes high vacuum, compression stroke restores this to slightly above atmospheric pressure.
TDC: 0
BDC: -14.7 psi vacuum
TDC: +1 psi pressure
The air in the cylinder is just a spring, and does nothing.
Even if it had full compression, how could 200 psi (or less) be more than the 1,000 or more from combustion?
Nothing will be hurt, since the cam lobe is the sensitive part.
However: if you a tappet escapes, guess where the oil pressure goes?
Boffin Emeritus
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