Talk:Hopping up the 500 Cadillac
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| + | Following put here for the time being--[[User:Cobalt327|Cobalt327]] 13:31, 9 April 2015 (MDT): | ||
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| + | I worked on Cadillac 500 engines back in the 1980s. By the time I replaced everything wrong inside these poncho Pontiac motors I had hordes of money in this thing. Frustration set in quickly. These engines have so many bad points it's hard to justify them. They are known to have weak oil pressure that can lead to a rebuild or two after an oil change if you don't prime the oil pump. Only stock pumps exist even today. No hi volume ones yet 28 years later. 3500 dollar heads now a days. Wow. For a lousy 100 hp. I decided to put two of these engines in my thoughts bucket and then used a big rig turbo on them back in 1989. I linked both together with a custom home made coupler. The car ran in the eights on the street on pump gas. I then boosted the engines up to 36 psi. I broke several rear ends not even getting to run the car much. It even broke a Dana 60 rear. I used alcohol in a kit beneath the pump gas carb. Got them running right. I spent 18 years running these motors with my friends in some of there cars. We eventually switched over to duel Chevy big blocks turboed. Too much low end torque isn't good for parts. The rods had broke next when the car did hook. Then the pistons. I replaced all that just to have both cranks break. The guys at cmd swore the cast cranks could take 3000 hp plus. I laughed on that one. Cadillac motors aren't special. They are all engines. If you can work on big block chevys, you can on cads too. Just a few rules to learn. This project Sr 71 as I called it put out 3500 hp out of the two engines before the cranks broke on the 4th run. As I say. Dynos aren't real world and do not tax motors very hard. It's funny when these magazine dynos say things like 1350 hp with stock internals with a turbo. Then they think it won't break in a car under load. Lol. Forged caddy cranks are hard to get and very costly. If I saved all my money from the Sr 71 cad project and went with my two tall deck 427.s I'd be at 450 MPh. With my duel Big blocks. 3500 hp at 36 pounds of boost and not with busted cranks. | ||
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| + | Cad to do list if you didn't know. re,drill. Flex plate at machine shop as they are only drilled for stock junk converters. replace conn rods with forged. replace cast pistons. No forged parts in this lux motor. Improve cad block oiling system and plumb new lines. buy a non regain thin diam. Cam. replace entire valvetrain. Or build your own. pay twice as much money for parts as chevys. offset grind crank .300 the other way to reduce stroke so engine can make power above 5000 rpm. hog out cad heads and install bigger taller valves to avoid 3500 heads. cut timing chain cover in half. deburr block some burrs are coming off with my fingernails and screwdriver. cut distributer and still won't fit hei under Camaro hood. make sure to get proper rear sump pan and pickup used. Very expensive. pick broken parts out of old oil pan and examine. hope oil pump shift doesn't fall out again into motor while putting hei back in Again. cad motor with big stroke will have to Rev higher to keep up with a smaller stroke engine you race against. get rid of uphill intake manifold. replace all main and head bolts. make sure to put every last bolt in oil pump. don't forget of ring on mile long pickup that looses prime after car sits for a day. buy custom motor mounts. make sure oil pump doesn't hit cars suspention. have fun changing spark plug on booster side of car. | ||
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| + | Spend 8000 dollars for 550 hp.--[[User:104.229.241.60|104.229.241.60]] 08:10, April 9, 2015 | ||
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