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Author Topic: 4.9 vs 3800SC  (Read 16698 times)

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Raydar

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Re: 4.9 vs 3800SC
« Reply #15 on: May 16, 2017, 05:20:50 pm »
I have to correct one misguided notion here, if I may.
Contrary to popular belief, you should NOT baby your new engine while breaking in.

I suppose I may have misspoken. I never meant that it should be babied. Just not "beaten upon".
...

f85gtron

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Re: 4.9 vs 3800SC
« Reply #16 on: May 16, 2017, 05:38:02 pm »
I don't see where you said to baby it. I didn't mean to call you out, Radar. I was commenting on the general direction of the line of questioning and just intended to steer the conversation a little. I hope nobody was offended. I've read so many opinions on the break in subject that I drew a general inference that:
1st start- 20 mins@minimum of 1500rpm to break in the top end. Drain and refill oil and filter
2nd start- run hard under load a few runs, but don't go over 4k, in order to set the rings
Break in- hard runs, no over 4k and varying speeds to properly break in cylinder walls, bearings, and finishing valve train break in. 
If you maintain a steady speed, your bearings will have a flat spot, potential for egging. 
85 GT manual NOW powered by 7730
3.4 bored to 3.5, cammed out and DIS'd
F23 connecting power to ground
My wife won't ride in it. It's "the other woman" ;)

GTRS Fiero

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Re: 4.9 vs 3800SC
« Reply #17 on: May 16, 2017, 06:51:59 pm »
I created a new thread to keep this one on topic.

GTRS Fiero

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Re: 4.9 vs 3800SC
« Reply #18 on: May 16, 2017, 06:56:44 pm »
The dyno chart told another story. It started to fall off at around 5K. Maximum power was about 135 HP. (That was through an automatic trans.)

Wait.  HP at the wheels on your 3.4 was only 135?  I thought you had 200 at the crank, with your mods.  65HP is a terrible driveline loss.