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Old 07-01-2011, 03:03 AM   #1
Diezeltitan08
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Default rebuild issues...a few questions

ive just done a deebs rebuild on my 98 sl2 along with dual intake cam mod...have a gs tb going on soon when i get time to fab up a throttle bracket. the story is...this is my first rebuild and my first time breaking in a motor. on the first start i built up oil pressure until light when out then started her up. let her run for 20 mins while bouncing the revs between 1300rpm and 2000rpm without letting it stay in any one spot. i then changed the oil while it was hot and filled over the head with valve cover off to make double sure oil was everywhere in the engine. reinstalled cover and drove around doing my best to engine break and do hard pulls between 3-4k and bouncing revs at idle. ive put maybe 30-40 miles on the motor and have a few concerns.

1. i feel like its heating up a little bit faster now than it was prior to the rebuild...never past the half mark and the past few days have been 85+ so that may be normal and me being an overprotective parent.
2. i have low power at low rpms and occasionally cannot rev past 5.5-6k
my buddy says its because the motor isnt broken in yet. is that true? will the symptom go away after a few hundred miles? also she takes off like a rocket at about 4k and if it lets me keep revving is strong all the way through 6.5k as it should be, (or at least thats where my powerband was prior to rebuild)
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Old 07-01-2011, 03:34 AM   #2
ktthecarguy
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Default Re: rebuild issues...a few questions

Hi there,

About number 1, did you put in a new thermostat? If so, then yes it will react faster than the old one. Mine did.

Don't know about number 2. Sorry.
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Old 07-01-2011, 03:48 AM   #3
Diezeltitan08
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Default Re: rebuild issues...a few questions

yes i did thank you i forgot all about that in my panic
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Old 07-01-2011, 04:07 AM   #4
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Default Re: rebuild issues...a few questions

The good news is your car will now go into closed loop operation much quicker, which means more accurate fuel metering, so better fuel economy.

So it's all good.
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Old 07-01-2011, 08:02 AM   #5
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Default Re: rebuild issues...a few questions

Part of the reason it's warming up faster the new engine is tight. More friction with the new rings, more compression, etc. etc.

once it's complete broken-in, probably in 3k or 4k it will become more 'normal'.

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Old 07-01-2011, 08:07 AM   #6
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Default Re: rebuild issues...a few questions

Between dual intake cams, '92 header & AEM CAI there was virtually no low rpm power on my ~190k mile old engine. All kinds of pull above ~4k rpm's though, kinda like the turbo in my old '89 900 SPG spooled up
Well, lots of pull once it stopped coughing on all the fracking oil the rings or valve guides dump into the cylinders... lol
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Old 07-01-2011, 08:18 AM   #7
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Default Re: rebuild issues...a few questions

You're trying to rev above 6k (repeatedly?) on a freshly rebuilt engine????

Even members of the "break it in like you stole it" group don't typically advise revving it above like 1/2 or 2/3 of the max rpm until it's had a few hundred miles or so to break in...

As for bouncing the revs all the time: that's really unnecessary. You shouldn't drive a constant speed on the highway, or let it idle for extended periods, but a minute or so won't hurt anything.

As has been said,it may heat up a bit faster for a little while--during break-in there's a lot more friction (although most of the breaking in should have been done within the first few minutes). As long as it's not getting too hot, I wouldn't be too worried about that.

Did you clock the cam correctly (it's pretty easy to have it off by one tooth--it'll run, but not well)?
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Old 07-01-2011, 09:09 AM   #8
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Default Re: rebuild issues...a few questions

Mine runs hotter, too. I replaced rings, a burned valve, reseated the valves, replaced valve seals, and bearings (old bearings showed no scratching, but general even wear of about .002'', and journals looked fine).

Likely the increased compression and reduced oil burning (oil burning makes the engine run excessively rich, which cools the flame), etc., caused the increased temperatures. My engine is entirely of stock design (no mods).
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Old 07-01-2011, 09:46 AM   #9
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Default Re: rebuild issues...a few questions

Quote:
Originally Posted by Diezeltitan08 View Post
cannot rev past 5.5-6k
Unless you are racing with this car, why would you want to rev the engine so high? It's a Saturn! A cheap, econo daily driver, not an Indy 500 race car! Or do you like to spend lots of money and time, just to see rods punch holes through engine blocks?
I may be showing my age, but back in the day, no one tried to make a slant 6 Dodge dart into a hotrod!
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Old 07-01-2011, 12:20 PM   #10
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Default Re: rebuild issues...a few questions

it is my lil go cart... i picked up the car for 300 bucks and until i finish my grand prix it will be my honda beater. i accidently revved past 5 because my 3rd gear pops out of gear occasionally and i did it another time to make sure my cams were clocked correctly
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Old 07-01-2011, 06:14 PM   #11
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Default Re: rebuild issues...a few questions

Quote:
Originally Posted by blue92 View Post
Unless you are racing with this car, why would you want to rev the engine so high? It's a Saturn! A cheap, econo daily driver, not an Indy 500 race car! Or do you like to spend lots of money and time, just to see rods punch holes through engine blocks?
I may be showing my age, but back in the day, no one tried to make a slant 6 Dodge dart into a hotrod!
Redline is there for a reason. Hit it once in a while and your car will be happier. My mom's '97 SC1 was happier after I convinced her of the same thing. Sounds like it's not the thing to do on a fresh rebuild, good to know
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The proper way to fix a S-Series automatic is to replace it with a 5spd O:)
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Old 07-07-2011, 06:05 PM   #12
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Default Re: rebuild issues...a few questions

more issues: now that the motor is fairly broken in ive developed a few problems. a serious oil leak which i hope is the valve cover...its leaking by the belt and both of those holes are stripped and cant get tight enough to hold down the valve cover. the scary part is that when the car idles the oil light blinks. i had the same issue with another car of mine and set the idle screw and raised it a little. that didn't work on the sl2. the car idles around 700 but im pretty sure it should be between 800-900
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Old 07-07-2011, 07:12 PM   #13
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Default Re: rebuild issues...a few questions

Quote:
Originally Posted by Diezeltitan08 View Post
it is my lil go cart... i picked up the car for 300 bucks and until i finish my grand prix it will be my honda beater. i accidently revved past 5 because my 3rd gear pops out of gear occasionally and i did it another time to make sure my cams were clocked correctly
If you have the M/T PCM the rev limiter should prevent you from entering the green. I understand that the PCM for the auto may not have this feature.

-Robert
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Old 07-07-2011, 07:27 PM   #14
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Default Re: rebuild issues...a few questions

green? you mean red right? and regardless its a m/t swap so im running with the autp pcm. no more top speed limiter!!! woot lol wish i still had a limiter though
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Im Not the Best, Im Just Better Than You!!!

S2N=Second II None( da crew)
GiGi=98 sl2 5spd
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