408 Dependibility
Thread Starter
Teching In
Joined: May 2010
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408 Dependibility Hi i was just wondering how many miles people where getting out of there 408's, with and with out nitrous. I was talking to a friend of mine, and he was telling me that 408 was a bad route especially for a nitrous car because the pistons come to far down and actually push on the sidewalls going up. Causing loss of power and added wear to the side skirts of the pistons. He suggested that i use stock stroke and larger bore and basically just rev the motor higher to get the power i was looking for. Now i have looks up the results from 408's on the bored and they seem to make great power which confuses me.
Launching!
Joined: May 2010
Posts: 274
Likes: 1
Hi i was just wondering how many miles people where getting out of there 408's, with and with out nitrous. I was talking to a friend of mine, and he was telling me that 408 was a bad route especially for a nitrous car because the pistons come to far down and actually push on the sidewalls going up. Causing loss of power and added wear to the side skirts of the pistons. He suggested that i use stock stroke and larger bore and basically just rev the motor higher to get the power i was looking for. Now i have looks up the results from 408's on the bored and they seem to make great power which confuses me.
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Staging Lane
Joined: May 2009
Posts: 99
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You want it to last as long as a stocker? buy a crate LS3. The 408 will last as long as any other "PERFORMANCE" engine. is this your daily driver (only car)?
Thread Starter
Teching In
Joined: May 2010
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There's more then just maintence, to keep the motor running long. I understand a performance motor won't last like a stock one and of course you have to maintain it properly but let's say a year or two from now when I decide to freshin up the rings and Bearings I don't want to pull my engine apart and find extra ware on my pistions and cylinder walls. Forged internals arnt cheap....
You're talking about R/S ratio. This measures about 1.53:1 on a 408 or a 383. All stroker engines have that increased stress or decreased R/S ratio. There are car manufacturers that produce engines with the R/S ratio in this range, although according to one website, can't remember which, but 1.75:1 is ideal. Stock is about 1.7:1.
So take that for what its worth, and remember there are some car manufacturers that issue that ratio for stock, so it can't be that bad...
So take that for what its worth, and remember there are some car manufacturers that issue that ratio for stock, so it can't be that bad...
Thread Starter
Teching In
Joined: May 2010
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I see, I figured it couldn't be too bad cause I know a ton of people run 408's. My machinest has been a family friend for years so I know he just wants wats best for me. But if u look at just about all the exotic cars they usualy use a small stroke and high rev's. Yes it might lose some low end torque but leas stroke and a higher reving motor I would think it would make just as much or more then a stroker.
If you use good quality forged crank, rods, and pistons, then use ARP rod bolts and steel top rings, I would not be afraid of a 200 shot of nitrous. It'll hold up better than stock.
FormerVendor
Joined: Nov 2001
Posts: 3,065
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From: Houston, Tx.
I see, I figured it couldn't be too bad cause I know a ton of people run 408's. My machinest has been a family friend for years so I know he just wants wats best for me. But if u look at just about all the exotic cars they usualy use a small stroke and high rev's. Yes it might lose some low end torque but leas stroke and a higher reving motor I would think it would make just as much or more then a stroker.
I think he used to use a lot of JE and some of all the rest but I don't like their pistons at all for an LSx 408 so far even though they are a great company. The skirt they were using just had way too much rock and didn'yt work well at all as far as the last ones we saw. With the Wiseco or Diamonds he and you will be fine.
