View Single Post
  #1  
Old September 25th, 2020, 05:39 PM
Autodoc Autodoc is offline
Junior Member
 
Join Date: Sep 2020
Location: AUSTIN, Texas
Truck: 478 dragster
Age: 48
Posts: 2
Rep Power: 0
Autodoc is on a distinguished road
Default Racing efforts with 478 v6

Does anyone here know what the fastest jimmy v6 is and what kind of build it has?
I just recently started studying the engine format, and it looks really appealing for making a very strong drag race engine. Just looking at the stock bore size and the head port design it looks like it has the potential to run at least the same power per cubic inch as a good inline valve head small block chevy or any big block chevy with regular 24-26° heads
Has anyone gone all out on one of these? With roller cam, big cam core with roller bearings lightweight pistons and valves, and a good porting and fabricated intake and headers, NA or supercharged/turbocharged?
What is the limiting factor, other than head flow?

There are a lot of specs listed in various places, but I never found the actual bore center spacing. Anyone got that, or can you measure a block or head gasket for cylinder spacing just from the front edge of one cylinder to the front edge of the next will do.

I remember reading somewhere that the middle cylinder might be offset for some reason, as in it does not perfectly line up with the other cylinders. It would seem odd when there is so much space between them already. No need to stagger them for extra room for coolant to circulate or whatever.

if the stock block and heads are not suitable for this kind of build(900hp NA) or maybe boasted around 1800-2500, then it certainly would be feasible to build a billet block or even new aluminum castings with even bigger bores on the same architecture, even the heads could be made to be pro stock levels of flow and combustion efficiency while retaining stock valve arrangement if the ports are moved around a little and the high camshaft and relatively short pushrods should be great for spinning it up to high rpm. I think the engine architecture itself is probably good enough to surpass all but the biggest big block chevies and hemis in potential power if the bore sizes that are achievable with that huge bore spacing can still function well at the rpms necessary.
Anyone built a nitro V6.
Myself, I would like to explore the potential of stock blocks and heads first, starting with a good head porting, offset grinding the crank for smaller rod bearings and a little more stroke, as big a cam bearing and cam core as will fit in the stock block, custom rockers and springs on taller, titanium valves and a sheet metal intake and long fat headers and see how high it will spin up. I would try and address any strength issues with the block that are evident from analyzing the design and maybe looking for what has failed in the past, and do any reinforcement possible, then if the heads seem like they work pretty well, try and see what kind of boost it will handle with a big turbo, then 2 big turbos, then maybe try some nitro.
Reply With Quote