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Dodge uncoils its most potent Vipers, the SRT-10 and the Competition Coupe
- Thread starter NFS4
- Start date
geno
Lifer
Ok, this is an 8.3 litre motor - show me a production motor that big (.83 litres per cyl) that dares to rev past 7k. Unheard of. I think even the Corvette's motor is limited to 6,500, and that's in a 5.7 V8
There's much higher of a chance. You're adding 3 cams to the motor and 20 more valves
Zenmervolt
Elite member
I think you meant adding two camshafts. (SOHC has one camshaft per bank or two camshafts total, DOHC would have two per bank or four total.)
ZV
EDIT: Spelling.
That 1hp/cuin has nothing to do with anything. It officially happened in the year 1956 when Mopar was the first with a hipo motor to hit 1 hp/cuin. The 354 hemi made 355 hp.
The reciprocating assembly in the V10 can't rev like that because it will blow a part. Its just too heavy. OTOH an 8000+ RPM 426 style HEMI is relatively easy to make. Still the King of Super Stock.
mAdD INDIAN
Diamond Member
Well it can be done (talking about hi-revs). Another question would be if the gains are worth it?
I remember reading up where some dude built up an NA LS1 with custom intake, heads, and various other stuff to put in his RX-7 (yes RX-7). The goal was to have a high reving, reliable, ligthweight motor (it was lighter than the rotary setup with turbo plumbing). I read some of the stuff he did, didn't understand half of it, but he reached his goals. It was something like 650hp and 500+ tq with a redline of 7400RPM (or something obscene) from the modified LS1. Very impressive. I think it cost him $20k+ on the engine work alone.
WinkOsmosis
Banned
Why does higher displacement prevent an engine from getting to higher rpm? Piston speed?
mAdD INDIAN
Diamond Member
Larger stroke by the pistons. If they have a large stroke, its harder for them to rev higher since they have more distance to travel. Thats why usually the lower displacement you go, the higher it can rev reliably. Hence 600cc motorcycle engines can rev to 10+k RPMs and F1 1.8L V10s can rev to 16+k RPMs.
Not quite. You can build a large stroke short rod engine for less piston travel and therefore higher RPM.
But don't forget about the reciprocating forces on the assembly. It is trying to tear the con-rods a part as you rev the engine higher. Rev any engine too high and you will have catastrphic con-rod failure. They are the weak link. But each engine does have its own built in max rev range.
Large displacement engines (from the factory) have very heavy reciprocating assemblies. This imposes very high forces on every component at high rpms and the weakest components will fail first. This is usually the con-rod bolts. That is why street small blocks were better for high reving. Big blocks (like a Buick 455) make their power at lower rpms. This is from sheer size and valvetrain components combined to put the power in a street friendly range.
You can make more power in the range that you drive normally in without having to rev the hell out of it. This is the most practical thing to do. Spending a fortune to make an engine rev very high but make little extra power is dumb. No one really cares if you can rev your engine to 8000 rpm.
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