View Poll Results: SBE or Forged
SBE
8
57.14%
Forged
6
42.86%
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New motor time. What should I do?
10-21-2019, 09:18 AM
#1
New motor time. What should I do? Had a little mishap setting up my Leash Boost controller which resulted in accidentally making 30lbs of boost on a tune good for about 15lbs. Result was a melted piston, two others with shattered ring lands, and three bent rods. This is a SBE 4.8. So now im trying to decide if I should just slap in another stock 4.8 or go ahead and build a motor with forged internals.
I was already planning on putting a cage, harnesses and kirkeys in over the winter so ill already be spending a pretty good chunk on the car this winter.
Ive found a relatively low mileage (not that im worried about the mileage) 09 4.8 for 600. I could sell the heads, intake and accessories off of it and recoup some of that money. If i go this route i could probably also switch to Holley terminator x this year.
OR i could go ahead and build a forged bottom end. This becomes a little more complicated because to use an off the shelf rod/piston combo i would have to switch to a 5.3 crank I think. I havent seen and forged rods that come in stock 4,8 stroke length. So by the time i have the block cleaned up i assume it will end up at least .10 over and then add the longer stroke, I would think I may need to replace the cam and maybe have the converter reworked?
the Cam is an ljms stage one and the converter was specd by Dusty specifically for this combo.
So, go simple and go with another SBE or build a forged bottom end. what say you?
I was already planning on putting a cage, harnesses and kirkeys in over the winter so ill already be spending a pretty good chunk on the car this winter.
Ive found a relatively low mileage (not that im worried about the mileage) 09 4.8 for 600. I could sell the heads, intake and accessories off of it and recoup some of that money. If i go this route i could probably also switch to Holley terminator x this year.
OR i could go ahead and build a forged bottom end. This becomes a little more complicated because to use an off the shelf rod/piston combo i would have to switch to a 5.3 crank I think. I havent seen and forged rods that come in stock 4,8 stroke length. So by the time i have the block cleaned up i assume it will end up at least .10 over and then add the longer stroke, I would think I may need to replace the cam and maybe have the converter reworked?
the Cam is an ljms stage one and the converter was specd by Dusty specifically for this combo.
So, go simple and go with another SBE or build a forged bottom end. what say you?
10-21-2019, 10:10 AM
#3
10-21-2019, 10:24 AM
#4
You need forged internals if you are going boosted.
They should tell you this.
Build it right the first time and don't skimp on parts.
This way the engine will last and be reliable.
They should tell you this.
Build it right the first time and don't skimp on parts.
This way the engine will last and be reliable.
10-21-2019, 10:39 AM
#6
TECH Senior Member
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2ndGenLSX (10-21-2019)
10-21-2019, 10:43 AM
#8
TECH Senior Member
That is its only advantage as far as how tough it is and its ability to rev higher than its longer stroke stablemates.
10-21-2019, 10:48 AM
#9
OP - I would slap another SBE in there and keep rocking! Double check your boost settings going forward or install another boost safety.
Hilarious! The amount spent on parts does not directly correlate to the lifespan of an engine. You certainly don't need forged internals for boost, in fact there is a whole market supporting the exact opposite of that these days.
Guys are getting hundreds of passes and thousands of miles out of junkyard engines... some (arguably most) last longer then the built engines people buy for thousands more.
Guys are getting hundreds of passes and thousands of miles out of junkyard engines... some (arguably most) last longer then the built engines people buy for thousands more.
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2ndGenLSX (10-21-2019)
10-21-2019, 11:04 AM
#11
OP - I would slap another SBE in there and keep rocking! Double check your boost settings going forward or install another boost safety.
Hilarious! The amount spent on parts does not directly correlate to the lifespan of an engine. You certainly don't need forged internals for boost, in fact there is a whole market supporting the exact opposite of that these days.
Guys are getting hundreds of passes and thousands of miles out of junkyard engines... some (arguably most) last longer then the built engines people buy for thousands more.
Hilarious! The amount spent on parts does not directly correlate to the lifespan of an engine. You certainly don't need forged internals for boost, in fact there is a whole market supporting the exact opposite of that these days.
Guys are getting hundreds of passes and thousands of miles out of junkyard engines... some (arguably most) last longer then the built engines people buy for thousands more.
I don't think it's wise running high boost with stock internals.
On any engine really.
And usually forged internals are more expensive than any stock internals.
I don't buy into running a stock motor with high boost and hoping for the best.
Low boost is ok.
10-21-2019, 11:08 AM
#12
Not trying to be an ***, genuine curiosity...
10-21-2019, 11:14 AM
#13
TECH Senior Member
10-21-2019, 11:26 AM
#14
Depends on how much boost you are running.
I don't think it's wise running high boost with stock internals.
On any engine really.
And usually forged internals are more expensive than any stock internals.
I don't buy into running a stock motor with high boost and hoping for the best.
Low boost is ok.
I don't think it's wise running high boost with stock internals.
On any engine really.
And usually forged internals are more expensive than any stock internals.
I don't buy into running a stock motor with high boost and hoping for the best.
Low boost is ok.
10-21-2019, 12:09 PM
#15
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Pretty sure what melted the Pistons was you went crazy lean? Kinda what it sounds like.
Personally? I would get a JY short block just to get it running. I hate a non-running car. Fix your boost controller or jump to a 3-bar setup so you can get fuel when overboosted.
If you still want a forged motor later, feel free. But then you do a planned swap in a weekend. Car downtime trumps all other concerns to me.
Personally? I would get a JY short block just to get it running. I hate a non-running car. Fix your boost controller or jump to a 3-bar setup so you can get fuel when overboosted.
If you still want a forged motor later, feel free. But then you do a planned swap in a weekend. Car downtime trumps all other concerns to me.
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rkupon1 (10-21-2019)
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cookseyb (10-26-2019)
10-21-2019, 03:20 PM
#17
1) How in TF did you not notice instantly that it was over boosting and let off? Mine went to 15-16lbs from a normal 10 and I KNEW something was off so I immediately let off.
2) My suggestion is if you have the coin, do forged piston and rods with a stock crank, in a 5.3. Thats my plan anyways for mine.
2) My suggestion is if you have the coin, do forged piston and rods with a stock crank, in a 5.3. Thats my plan anyways for mine.
10-21-2019, 03:49 PM
#20
he doesnt "need" but he probably should, especially if he cant let off the go pedal fast enough when its over boosting.
BTW, OP, do something to keep if from over boosting, I added fuel to mine past a certain extent. If you rely on the boost controller only to protect you, you are making a mistake. if the wastegate fails and pins open, your boost controller wont do anything. I made mine real rich where I can tell something is off if it goes past my threshold.