Thread: hosrepower 305

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Looks like the "Rat Rod" thread has the most ever posts!!! I think I might post on it again to insure it's place in CHR history...

Dave Brisco

I run a Lola Can Am and we are limited to 5000 cc(305 c.i.) (Formula 5000 based) 610 hp at 8200 rpm, Lucas timed injection.

This is an overgeneralization, but the smaller stroke the higher we can make it rev, all mods being equal. The higher we can rev it, the less we have to shift. One saved shift is really two because if we don't have to shift from 3rd to 4th coming out of turn five, then we don't have to shift bact o\to 3rd going into turn six. These are road race concerns, not Hot Rod concerns, my only point is that a 305 can grow some balls if it needs to, and out rev a 350 similarly equipped, and by that I mean last longer at the same rev limit. I took out the 327 that had been bored and stroked to a 388 in order to be legal, but have run better lap times due to the higher rev limit. Either motor is only good for 25 hours in a Can Am car and then needs to be freshened up, so longevity is a relative aspect for sure.
regards,
Johan

Hey Bob Parmenter, you oughta look at the "top Ten" again! i am in tenth place for most replied thread!!!! thats cool
Well screamer, streets and all who know what i am talking about, i found out that my dad has plans for the 350. he's gonna try to make a hybrid. he is gonna put the 350 in to an older ford i think that it is a 60's model. sounds cool but will it work?
i have a nother question. to get to the neutral safety switch, do i have to take the whole dash thats surrounding all my meters and stuff? and how much would a new one cost if it is worn out and how can i tell if the switch is worn out?

i don't know what i am looking at when i look at the above pic. what is it ? is it fast? does the car that its in have good traction? i love speed and traction!! thats why i want a fast car one of these days!

Hi,
Yes it has decent traction in 3rd, 4th and 5th.

Thats not much of a gas tank, I guess .....thats why you have " 2 ", I couldn't even make it to the store on that , in my 454' .

I feel it would be unfair of me not to mention that we produce the 305c.i. by "destroking" a327.

I am more familiar with revs and motorcycle engines...10k revs is not unheard of, and Yamaha made a 250cc 4 cylinder that revved to 19,000!! for sale in japan a few years back.

ON bikes that rev like crazy, you shift MORE because the powerband is in a very narrow rev range. I can see where fewer shifts would save 'time'.

i think theres a saying that goes around, "theres no replacement for displacement" thats quite true in the HOT ROD world i think, im sure you could make 1000 horse from a 305 but nobody tosses around 20K at a time that i no of.

if you have a shorter stroke then there is actually less distance being traveled hence the motor will turn faster. So being that your taking a 327(3.25 stroke) which already has a shorter stroke than a 305, and shortening it to appr. 3.03" then naturally tehd motor is going to rev higher, therefore total displacement is not that much of a factor in realation to peak rpm's. Just my 2 cents

Don't recall the figure, but revs are limited by piston speed, as in feet per second traveled in the cylinder. There is some max for this.

also, lighter pistons and stronger rods help get teh revs up there, as does shorter stroke. you also need a very good valve train!

Ducati doesn;t use valve springs to close their valves, so in theory you have less inertia and no float and should be able to get more revs. Of course, valve adjustments are horrendously expensive and needed frequently.

Originally posted by screamer63_1979
MSD - Multi Spark Discharge (also a company that makes ignitions). Stock ignition systems make ONE spark to fire the mixture. MSD ignitions fire multiple sparks very quickly to fire the mixture.

and who says you dont learn something new everyday.


that 305 engine your talking about isnt practicle theres cheaper ways to make that amount of horse power a complete RAMJET 502 will make from a starting point 500hp and that leaves tons of room for mods all for about $9K

back on the subject of a 327 i have one thats making about 400hp and 400tq with no exotic mods, just a camshaft and roller rockers, and some racing parts, but i didnt spend over $3k for it. the manifold was the most expensive part other then the forged crank