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fixing the LT1 Optispark nightmare
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10sec.et
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Joined: 29 Mar 2006
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Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Sun Aug 08, 2010 4:38 am    Post subject: fixing the LT1 Optispark nightmare Reply with quote

as some you know, my Delteq system on my LT1 took a crap. its been on the car for 6 years or so and since Delteq is no longer in business, its trash. so, after hearing rumors of distributors being stuck in the back of an LT1, i did a bit of research. what i found was some information where someone used a LT4 intake and put a hole in the back and used an adjustable collar on the distributor shaft. since i was done dumping $$$ into this ignition system, i decided to see what i could do with a low-buck approach in mind. i was originally going to try to convert a carb intake over to use on the LT1 (which Adam graciously donated Cheers I'm not worthy ) but i quickly found out that it was a hell of a lot of work to make that happen. instead, i just cut a section from the carb intake and grafted it onto the LT1 intake. this did require cutting off the EGR passages from the LT1 intake but i will be fabricating an external EGR housing for that. heres a few pics so it all makes sense....









notice the wide bolt spacing ? no way to fit an "old school" intake on there without a lot of welding and machining.









i put several layers of tape so i would have some space for the silicone when the intake was bolted down.





the distributor is from a late 90s Chevy Vortech 5.7L suburban.







intake was then carefully slid into place, bolted down and tacked together.






welds look like hammered dog sh!t because i welded it with a MIG. i did a little cleanup before installing. it is welded on both sides . i clamped it down to some heavy wall square tubing before welding but the back corners still pulled up a bit. i just clamped it back down again and heated the back with a torch and let it cool. it came back enough that im not worried about milling it.




the EGR port is drilled and tapped to 1/2" NPT









the distributor and intake have to go into the engine together. theres not enough room to install or remove the distributor once the intake is installed. from there its just a matter of making your own wires. i took the old ones apart and built my own. if anyone is interested in those details, i can post them up. also the coil and ign module wires need to be lengthened about 3 feet. heres my last pic before firing it up.....




i still need to put tubing over the wiring but i have driven it and it runs GREAT!!!!

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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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af2
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1933 Willys Coupe

PostPosted: Sun Aug 08, 2010 2:42 pm    Post subject: Reply with quote

Wow!!!! I am impressed. Cool Tenacious comes to mind. Laughing

Glad you could use at least part of the intake.
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MufflerBearings69
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1968 Ford Galaxy

PostPosted: Sun Aug 08, 2010 2:57 pm    Post subject: Reply with quote

a quick blast with some coarse aluminum oxide after all the smoothing would have made it look as-cast again... I suppose as far back as its tucked it wouldnt matter...

Looks good- excellent solution

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Knarley Darley
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PostPosted: Mon Aug 09, 2010 12:01 am    Post subject: Reply with quote

Outrageous!!!!!!! How long did that take? Man I would love to have the time. It seems like lately(last 2 years or so) all I have had time to do is work and hang on through this bumpy economy (mostly just a long steady decline)
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Mon Aug 09, 2010 1:10 am    Post subject: Reply with quote

Nice job!
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Big Dave
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PostPosted: Mon Aug 09, 2010 11:23 am    Post subject: Reply with quote

Great Job!

I stole your photos for a how to the next time the issue crops up I can repost them.

Big Dave
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clay
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1972 Chevrolet Nova

PostPosted: Mon Aug 09, 2010 4:47 pm    Post subject: Reply with quote

I really hope I can meet you some day. Tenacious or hard headed, whatever you get it done - and I love it. Good solution and what a lot of work. Maybe you just need to buy a p.o.s. Saturn Laughing . All I can say is WOW. Clay
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Mon Aug 09, 2010 10:58 pm    Post subject: Reply with quote

thanks Cheers

Knarley, i think i have about 20 hours invested.

Dave, thats what the pics are there for Wink .

Clay, we ALL need to find a central location and get together for a SMOKEmUP BASH Cool Cool Cool

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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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William Jones
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1971 Ford Mustang

PostPosted: Tue Aug 10, 2010 1:45 am    Post subject: Reply with quote

Nice work that is what hot rodding and thinking out side the box is all about. I like to say this to my guys around the shop and track "We don't have problems we have solutions" but my other favorite saying seems to happen alot also "Achieveing excellence thru failure" LOL

Bam

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clay
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PostPosted: Tue Aug 10, 2010 2:53 pm    Post subject: Reply with quote

Quote:
"Achieveing excellence thru failure"

I like that quote. I keep trying to explain to my daughter that you always learn more when things go bad - it's not fun - but you learn. Clay

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William Jones
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1971 Ford Mustang

PostPosted: Wed Aug 11, 2010 1:03 am    Post subject: Reply with quote

Yeah I wish my son could understand it. Its better to have tried and failed but learned something then to never give it a shot we have all failed. But if you learn somthing it was worth it thats how I feel.

Bam

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Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Thu Aug 12, 2010 9:11 pm    Post subject: Reply with quote

that job would have been a bitch on a f-body w/ the motor still in the car
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Fri Aug 13, 2010 12:43 am    Post subject: Reply with quote

yeah, you would probably have to take the motor mounts out and rest the engine on the frame to do this. once installed, i think there should be just enough room. im going to find out. our Camaro has a LT1 in it............ Twisted Evil .
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Rebel
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PostPosted: Sat Aug 14, 2010 8:59 pm    Post subject: Reply with quote

Now you know what i have to live with an Amc Laughing
Nice work I'm not worthy

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af2
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1933 Willys Coupe

PostPosted: Sat Aug 14, 2010 10:33 pm    Post subject: Reply with quote

Rebel wrote:
Now you know what i have to live with an Amc Laughing
Nice work I'm not worthy


I wish the sbc had the valley pan and water pump to the heads. It would make life great fabbing an intake!
I probably would have done way more than my 1. Shocked
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