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1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-23-2005, 10:52 PM   #131
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Maybe some help-
http://www.performancetrends.com/cr12.htm

I'm sending you a program to help find your DCR & SCR, this should ballpark the fuel requirements.
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Old 03-23-2005, 11:02 PM   #132
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Trash the e-mail I sent ya, heres the webpage. Read it carefully, then download the program & try it out. Youll need all your cam specs to do this (all your specs really).

http://cochise.uia.net/pkelley2/DynamicCR.html
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Old 03-24-2005, 01:14 AM   #133
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That seems like a great program.. if I were running windows. I tried it under WINE and it doesn't even want to install. Maybe I can get someone to do it for me


-justin
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Old 03-25-2005, 11:12 PM   #134
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More good reading for ya!
http://www.chevytalk.org/threads/sho...page=0#1137028

just remember, dont base your whole engine build around your DCR. Its just a vague number, another stat. Your not drastically changing things in your engine-just bumping the compression up a bit & maybe stabbing in a slightly larger cam. Neither of these things will force you to change much from what you do with it when its stock. If I were looking for more get up & go from our cars, I'd look into a better torque converter-problem is no-one makes good ones for our cars. You could send the stocker out to get restalled, but the price will probably not be worth the results.

If you have these specs i can run the DCR progam for ya (you will need all of your cam specs)-
rod length
adv intake closing time (seat timing, not .050 timing)
adv intake duration
adv exhaust duration
lobe separation
intake lobe centerline
combustion chamber cc'*
compressed head gasket thickness
head gasket bore
piston to deck height
valve relief cc'* in the piston
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Old 03-26-2005, 01:44 PM   #135
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Wow, I don't have all those specs. Some, but not all. Damn. But yeah, I promised myself if I need more power to the point I need to replace the camshaft, I am getting a new car. This is not the car to be modifying at this point. I love this car to death, but I have a 231ci engine, that is nothing in the world of large displacement engines. It isn't going to get me anywhere, unfortunately.

My best bet at this point, is to find an online engine building vet, and see what he thinks. Unfortunately my dad doesn't really care about my *STUPID* car, so yeah [he'* built, and rebuilt about 4 or 5 engines in his lifetime, not a lot, but enough to know what he'* talking about].


-justin
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Old 03-26-2005, 03:07 PM   #136
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Afraid the "C" 3800 is pretty near the limit on a lot of things though a bit more cam might help. However the "L" engine also increased the throttle bore by about 30% and the exhaust dianeter about the same and eventually went to a much larger air filter, all of which are marginal on a "C"

One thing you can do with the heads off is to clean up the outlet on the rear exhaust manifold, have seen some that were closed down a significant amount - look in the collector pipe (where the O2 sensor screws in) and see what it looks like.

Free flow air cleaner maight help at the higher rpm range buut not sure the cam can use an increase.

Next easiest improvement is a GX3 (3.33 ratio) transaxle.

For anything more, I'd seriously consider swapping in a "L" engine.
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Old 03-26-2005, 04:25 PM   #137
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Again, I'm not going to dig into my engine, let alone put another in. I am sorry, but this is not the car for that kind of performance [at least not my gen]. Like I said, I love this car to death, but it isn't made to be a 10 second car. If I get high 14s, I will be ecstatic. Low 15s I will be happy.


-justin
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Old 04-05-2005, 11:59 AM   #138
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In the lastest issue of Engine Masters, they did a comparison between 8,9,10,&11 :1 CR, and they said it is about a 4% hp increase for every point increase. This a rough estimate, but it works. So, 165hp x .04 = 6.6hp. That is pathetic. Best case I get 10hp, 15ft lbs. That isn't worth the $100 I was quoted for the decking. At the most I may get 200hp with all the other mods I get, which is 8hp. I would love to say I have 10:1 CR, but this isn't worth all the other stuff I am going to have to do, let alone the cost and worries of "Oh **** is this going to work?"

I realize this comparison was done on a much larger, and much different engine than mine. But think, really how much more of an increase could I get? Honestly how good could it be? Like I said, best case scenario I get 10hp. I know my money could go better spent on other mods.

My Overhaul Gasket Set is on it'* way, porting is going to be done this week [Spring Break for me], and tonight I am going to Autozone and going to pick up some head bolts [Fel Pro makes 'em, or maybe I should get some ARP ones? I would rather not go to a dealer], and some Valve Seals.. probably just some Fel-Pro Replacements, unless they have Viton ones in stock and cheap.

How does that sound, guys?

-justin
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Old 04-07-2005, 10:14 AM   #139
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Old 04-08-2005, 12:19 AM   #140
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Sounds good to me. It was pretty risky before.
Maybe you can start saving for rockers?
haha just messin. one step at a time.
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