How much is to much? (Blow by)

Looking at 7.3s right now. I have had a few in my day but never any with noticeable blow by. So when I pop that oil cap off at what point should I be scared on a 7.3 with 250k miles?

I'm looking at OBS & NBS 7.3s if that matters. I will do the basics to the truck. Intake tuner and exhaust and transmission work. Most likely going with a standard 4x4.

Generally, take the cap off, flip it upside down and set it on the spout, if it blows it off, it's too much.

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I just read something to that effect on youtube. Now I have a better idea on it.

79jasper said:

Generally, take the cap off, flip it upside down and set it on the spout, if it blows it off, it's too much.

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:stupid:

79jasper said:

Generally, take the cap off, flip it upside down and set it on the spout, if it blows it off, it's too much.

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It's SUPPOSE to stay on???

Crap.....,

My 2 cents...

If the blowby is enough to have you concerned, then a compression test is needed

swinky said:

:stupid:

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If you have something to add, then do it.
Mine doesn't have the valve cover extension tube, and it'd just rattle it off anyways.

And I'm not berman, dammit!

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79jasper said:

If you have something to add, then do it.
Mine doesn't have the valve cover extension tube, and it'd just rattle it off anyways.

And I'm not berman, dammit!

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I'm just saying I agree with you.

Oh okay, gotcha.
Most smileys and stuff don't show up on my Tapatalk.

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OBS-Addiction97 said:

It's SUPPOSE to stay on???

Crap.....,

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If it makes you feel better mine wont even rattle off

Only 114000 miles on my engine though!

Another question. I'm looking at a e99 F350. Guy says he has swapped out the plenums, bellows, pedestal and all out to late 99 elbow left the e99 turbo on. Is this possible?

WILD_PHIL said:

Another question. I'm looking at a e99 F350. Guy says he has swapped out the plenums, bellows, pedestal and all out to late 99 elbow left the e99 turbo on. Is this possible?

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I think the pedestal is diffrent. I have both early and late trucks and when I ordered turbo parts they emphasized the difference never really looked at them side by side though.

My late mod 7.3 has almost 400k on it now and is a 2.5 ton mud truck that just doesn't die. Rebuilt the top end with studs comp springs valves 200 injectors and hpop. Beat the hell out of it and the bottom end still manages to stay together.

7.3s just blow my mind :ford:

WILD_PHIL said:

Another question. I'm looking at a e99 F350. Guy says he has swapped out the plenums, bellows, pedestal and all out to late 99 elbow left the e99 turbo on. Is this possible?

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No not possible. The late up pipes and pedestal sit too high for an e99 turbo to work

ghohouston said:

No not possible. The late up pipes and pedestal sit too high for an e99 turbo to work

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yeppers

live life full throttle

I use a ping pong ball, and do the test when the engine is at operating temperature.

Seems like the ping pong ball would be super light. I'll have to try that just to see it.

Good video. I got a decent deal on a e99 with 20k on the motor and all the basic upgrades. Everything is late 99 except the turbo. I'm pretty happy with it.

I just did this test on my e99 with 263k miles. It must still be pretty tight because there was no noticeable blow by. Yes, I know it has some, all engines do, but it definitely isn't abnormal. My oil cap would stay if it didn't rattle off.