average hour life of a 2.5 280hp

[brjr]

how many hours (in general) can be ran on a 2.5 280hp block before it is in need of a rebuild.

[whipper]

I dont own one but was told pstons and rings every 80-90 hrs for 260 and 280's.

[WATERWINGS]

Hell, I'd have to rebuild twice a year :eek:

[whipper]

Ok John.;) basically your wear will be in direct perportions to how hard you use it. A leak down will tell you when you need to open her up. Like I said I never owned a 280. 90 hours to 200+ hours all depends on what the leak down tells ya. If your motor has over 100hours on it I would be checking it often.;) If the readings are good your good to go.

[jphii]

Hell, I'd have to rebuild twice a year :eek:

At least!!

[johnt]

somone posted here a while back, had 195 hours on his 280, excellent comp. and leakdown, he ran full synthetic oil. all depends on how you run it..

[rpm racing]

Really it depends on if you want to renic the block when you do eventually blow it up or rebuild it.

With 2 ring pistons the leak down will stay pretty good for a long time after the top ring is scrap. The rings get so sharp that it scraps the nic off the cylinder, but the bottom ring will still show a decent leakdown number. If you run good, clean oil and gas and you don't mind getting the block renicked when you tear it down I would say over 150 hours could be had.

If I ran a 280 I would be doing the rings after about 60 hours tops, and keep the nic in good shape. Rings are not that expensive........blocks are.

[RBT]

What RPM said!

[Techno]

Does this hourly thing still count if you cruise 50% of the time and WOT 50%?
Or would it mostly count for the WOT engine time?

[WATERWINGS]

A guy here in town had 350 hours on a 280 with still good leakdown and compression.

But it sounds like the bottom ring was where he was getting his readings from.

[rpm racing]

Techno at wide open or a motor used in a race aplication I would say you should be rebuilding every 20-30 hours MAX.

I put about 15-20 hours of actual real running on my drag motor and then tear it down and rebuild it.

[jphii]

A guy here in town had 350 hours on a 280 with still good leakdown and compression.

But it sounds like the bottom ring was where he was getting his readings from.


Are you talking about Braxton? Cause the last I heard he had some holes in his.

[flabum1017]

Are you talking about Braxton? Cause the last I heard he had some holes in his.


LOL



As everyone here has said.....depends on how you run it and take care of it. I can make a motor last 500 hours or I can kill t in 3.

[150aintenuff]

LOL



As everyone here has said.....depends on how you run it and take care of it. I can make a motor last 500 hours or I can kill t in 3.

sounds about right.... ive done both...

[Jay Smith]

Most 280 I rebuild that don't need extensive work are somewhere near 140 hours... Any more hours your taking a chance without a close handle on leakdown , some of these 300 + hours claims on 280s with good leakdown numbers are IMO unrealistic not to say thier wrong BUT that situation is different from what I personelly withess on a weekly basis.

I build several 280's a month ( at least 3 ) and the folks that go longer than normally safe 120-140 hours and haven't kept a handle on leakdown numbers I find will have normally egged bores and or Nicom issues close to the tops of the deck where the ring seal is critical for making optimal power...

Just my observations,

[bigtis]

Most 280 I rebuild that don't need extensive work are somewhere near 140 hours... Any more hours your taking a chance without a close handle on leakdown , some of these 300 + hours claims on 280s with good leakdown numbers are IMO unrealistic not to say thier wrong BUT that situation is different from what I personelly withess on a weekly basis.

I build several 280's a month ( at least 3 ) and the folks that go longer than normally safe 120-140 hours and haven't kept a handle on leakdown numbers I find will have normally egged bores and or Nicom issues close to the tops of the deck where the ring seal is critical for making optimal power...

Just my observations,Well said, Thanks for the knowledge!

[BRAVEHEART]

I have a pair of 2.5 280's on my 28 Skater with 155 hours on em right now. Just did a Comp check and LD with good numbers.
I'm gonna risk it for one more run up the CT River on oct 20. Then definitely go through them.