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Topic: Timing Help (I think) Needed!

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Re: Timing Help (I think) Needed!

Posted: 11/26/13 9:44am Message 11 of 20
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Vette(s): 1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
Thanks again, guys. 
Joel: It's quite possible I got the order wrong on the plug wires, or they were all off one notch, or I was off a tooth.  But I've already pulled the dist so I'm just going to do it the manual way.  Tonight I'm going to get it turned to 12 deg BTDC (a good starting place for my engine) on compression stroke and then set the dist so rotor is pointing at exactly #1 on the cap.  That way I can get the dist body sitting exactly the way I want it.  Sound OK?
 
Greg: Thanks for your input.  I have also been worried about binding since my machinist DID mill my block down a small amount, but now I'm thinking it's just kicking back on me a bit.  I drove it for 1500 miles with the other distributor and there were no issues and the dist gear was not damaged.  Also the engine turned over normal for three or four revolutions - didn't start acting weird until it wanted to fire.  But I think I will check for vertical play like the DUI article mentions, just in case. 




 

1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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Re: Timing Help (I think) Needed!

Posted: 11/26/13 11:01am Message 12 of 20
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Case75 said  Dave made reference to a drag on the starter so that's what came to mind.  Could be any number of things that I can't even think of and I hope it's something real simple. I'm not a mechanic but I try to help out where I can.


No problem...every idea is usable in some way or another. The more, the merrier! Thumbs Up

Dave...why not just drop it in at "0", instead of trying to get your initial 12 deg? Chances are, if you install the dist with the crank at 12 degBTC, you may not have any adjustment left to twist the dist if needed.....
Granted, I've never attempted to install one already advanced like that, so I don't really know how that works out....but it is an interesting concept. Thumbs Up



Joel Adams
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Re: Timing Help (I think) Needed!

Posted: 11/26/13 11:02pm Message 13 of 20
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Vette(s): 1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
Joel, my idea for putting it in at 12 degrees is to hopefully avoid having to turn the distributor very much when I'm timing it with a light.  Theoretically, if I have #1 set at 12 deg BTDC, rotor pointing right at #1 in the cap, and shaft/base relationship is set right at a trigger point, wouldn't the timing be right on at 12?  I know it won't be perfect but I'm hoping it's close.  And I have to admit, it's really only an aesthetic thing - I want the base of the distributor to have it's connections along the axis of the car (e.g. the wires that come out the front should be directly in front), not all cockeyed like they usually are after they've been timed.  (Especially if you are running more advance than stock).  And I do still run the original shielding so you can't have it too cockeyed.  But please do correct me if I'm wrong on this logic.  I'm kind of making some assumptions here.   

I have it all ready to go based on the above but was too chicken to start it!  Actually I get off work early tomorrow so I might get home with some daylight left to mess around with it.  

BTW, I did check up and down play on the shaft and also turned the engine over a few times once the dist was in and all seems to be well in that area....




 

1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Re: Timing Help (I think) Needed!

Posted: 11/27/13 11:16am Message 14 of 20
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
 Don't know Dave....I've never tried to pre-advance a dist, so I can't say it will, or will NOT work. Heck...let's find out! TAG!! Yer IT! LOL


Joel Adams
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Re: Timing Help (I think) Needed!

Posted: 11/28/13 9:10am Message 15 of 20
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Vette(s): 1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
Well, it worked, but I may have gotten partially lucky that it did.  It's set in there and running good, timed at about 16 degrees initial and the cap is oriented the way I want it to.  Still have to get the advance curve right though.  Looks like I'm only getting about 26 total (initial + mechanical) everything I've read says you want about 36 total and for it to be all in at 2500 rpm. I have a pretty light set of springs in there - one light spring (copper colored) and one medium spring (silver).  I might have to try using both copper springs.  But it's running good now, and has good throttle response and it's not pinging, so going to leave well enough alone for now.  Might even drive it to my mother in law's for the feast today.  

Happy Thanksgiving!






 

1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Re: Timing Help (I think) Needed!

Posted: 11/28/13 10:28am Message 16 of 20
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Woodland, WA - USA
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Vette(s): 1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion
Great to hear you got in and going Happy Thanks giving to all I am smelling the food know


Re: Timing Help (I think) Needed!

Posted: 11/28/13 2:23pm Message 17 of 20
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Vette(s): 1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.
That's great news Dave!


 
Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ

Re: Timing Help (I think) Needed!

Posted: 11/29/13 5:20am Message 18 of 20
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
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Joel Adams
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Re: Timing Help (I think) Needed!

Posted: 11/29/13 5:26pm Message 19 of 20
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Vancouver, WA - USA
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Vette(s): 1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
Car made it to my mother-in-law's and back (Woodburn, OR - 80 mile round trip) no issues.  Ran like a top the whole way.  Thanks for the help, guys!  



 

1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Re: Timing Help (I think) Needed!

Posted: 11/30/13 10:01am Message 20 of 20
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Canada
Joined: 6/19/2012
Posts: 230
Vette(s): 1975 Corvette 383 stroker w/Patriot 190 heads, Eagle stroker kit, Comp 279TH7 cam, DUI distributor, Edelbrock 7116 intake, Edelbrock 1806 carb, Hedman Hedders, TH400 w/TCI Breakaway 2400 stall, Transgo 1-2 shift kit.
daveo76 said: Car made it to my mother-in-law's and back (Woodburn, OR - 80 mile round trip) no issues.  Ran like a top the whole way.  Thanks for the help, guys!  

Great when a plan comes together, eh Dave? Big smile




 
Build Date: May 7, 1975. 383 w/267 RWHP/310 RWTQ

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