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Maximum Hp!!

Started by _hux454_ , May 31 2006 03:36 PM

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30 replies to this topic

#1 _hux454_

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Posted 31 May 2006 - 03:36 PM

G'day All,
Was wondering what is the max. HP you can get out of a 308 with standard heads without stroking, changing heads, supercharging, nitro, turbo, etc. When I say standard heads, that means do what you can with them ie. max port & polishing, rollers etc. This also includes placing on performance inlet manifolds, carbies etc. Mine puts out approx. 360fwhp. Is this good? Have been told that around 400fwhp is the max you can get out of the old motors remembering that a 308 isn't a big cubed motor.

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Edited by hux454, 31 May 2006 - 03:39 PM.

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#2 _MRNOS_

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Posted 31 May 2006 - 03:55 PM

The highest ive seen was a HADDAD motor which made 440hp with early heads standard stroke, few years back in a Yellow L34

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#3 _hux454_

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Posted 31 May 2006 - 04:03 PM

I should also explain that I'm talking mainly about about your average bloke like you & I rebuilding his cruiser not the big company's that have mega dollars to throw at the project when cost is not a factor.

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#4 _MRNOS_

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Posted 31 May 2006 - 04:13 PM

The guys at the Brock Shop here in brisbane used to have a few standard stroke 308's running around that were making around 400hp with early heads and rochesters too, but yeah budget plays a big part..

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#5 makka

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Posted 31 May 2006 - 04:16 PM

I belive that ultrablue's car is putting out some serious hp, and I think it is running old style heads

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#6 _MRNOS_

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Posted 31 May 2006 - 04:20 PM

Big $$$$$ Ex Larry Perkins bottomend from what I remember Glenn telling me, but yeah early heads

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#7 _[2_FLY]_

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Posted 31 May 2006 - 04:21 PM

Mine makes around 400 hp at the fly with a hyrdaulic cam and early heads. I think with some decent rods and forged pistons, along with a decent size solid cam would be easy to crack 450hp reliably. Dont know how streetable it would be though

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#8 _MRNOS_

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Posted 31 May 2006 - 04:25 PM

And I also remember a guy I worked with a few years back had a 308 VK commodore, ported early heads, stripmaster intake, 700dp, 10-1 compression, crane cc288solid(friggin big), still standard stroke made 410hp at the engine on his engine builders dyno

Edited by NOSLH, 31 May 2006 - 04:25 PM.

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#9 _Yella SLuR_

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Posted 31 May 2006 - 04:32 PM

195 RWHP using 30% rule of thumb drive train losses on your 260 flywheel, which is what you'd expect for a standard 308. Can have a look here for our recent dyno figures. Mine's nothing special other than the cam I selected, extractors, yella terra St. 3 heads, and soon to be larger air cleaner (too restrictive) pushed out 210 RWHP. Running a bit lean, so there might be a few more neddies hiding in there. All the fairly stockish 308's pulled between 195 and 230ish RWHP.

Edited by Yella SLuR, 31 May 2006 - 04:33 PM.

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#10 boomfunk

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Posted 31 May 2006 - 04:42 PM

Ive seen 380 hp, but ive heard alot of people making 400 hp

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#11 _Yella SLuR_

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Posted 31 May 2006 - 04:53 PM

^ I think the key was without spending lots of money. I haven't, and neither have the other guys. Getting anywhere close to or over 1hp/cube costs a fair few bucks. Then there is always the gloat factor to consider, have you seen Dyno's for these so called 400HP 308's? More often than not, I find that they take the RWHP figure, add 30% for Flywheel, then a bit more for bragging rights (some call it rounding up like with GST).

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#12 _[2_FLY]_

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Posted 31 May 2006 - 05:27 PM

Hey hux just out of interest whats ya rwhp figure?

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#13 LhMusL

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Posted 31 May 2006 - 05:30 PM

i got 200rwkw = 350hp@fly ruffly
I didn't spend the cash on it but my mate spent a fair bit.
its a 308 .30' over 11.5:1 comp 288 solid single plain intake with twin GRA LPG carbs.
Without the big converter i would say it would be a good street package but don't know how long it would hold together if driven daily.
i would say 300-350hp flywheel is a nice street package as its heaps for me, even if i do want more but i always will!!
Its not a daily driver.

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#14 _[BOTTLEDUP]_

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Posted 31 May 2006 - 07:16 PM

If you can get 1.5hp per cube then its a very good street engine... If you can get 1.7 then you've got an extremely good one.

I'd say that 380-400 is quite possible out of B cast heads in a street type application. Having seen what a really good set will flow I'd personally say that 450 or so would have to be about the limit.

Going back about 6 years ago there was a VK here in Perth running Yella Terra 'Road Racer' heads (before they stopped producing cast iron heads) that made 348rwhp on a Dynojet Dyno. I'd say it was making close to 450-460hp flywheel. Mind you it turned to 8200.

Edited by [BOTTLEDUP], 31 May 2006 - 07:17 PM.

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#15 _dannylxss_

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Posted 31 May 2006 - 10:54 PM

i have 350hp with b casts and standard rockers

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#16 gtrboyy

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Posted 31 May 2006 - 11:15 PM

Knew a guy that built a 308 with 253 crank,265 rods,11:1,288 solid cam,modified torker & B cast heads,didnt know the horsepower but it used to run mid to low 11s with a top loader & nine inch.This thing was mean until it snapped the crank but it did last two years.

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#17 REDA9X

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Posted 01 June 2006 - 07:37 AM

Back in the days of Group C, the best 308's were putting out 400-420hp on a good day. Not very drivable back then, but they were limited to using standard L34 heads and inlet manifold.

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#18 Redslur

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Posted 01 June 2006 - 01:29 PM

Standard 308's would put around 160RWHP. That's going on the the advertised LH figure of 240 fwhp and the LX 250 fwhp. I'm not sure of the comparison in shootout mode. It doesn't seem consistent. Anything with 200RWHP is getting into the 300hp area. Once again not sure of the comparison with shootout mode..

Hux, you should be looking at 250RWHP on an honest dyno..(not shootout mode)..

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#19 boomfunk

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Posted 01 June 2006 - 01:40 PM

i have seen dyno sheets and time cards... but a *** load of money spent..

380 hp, then blew up ... then next time they spent something around 20 g's but with vn heads..

crazy if you got money to burn then why not !!

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#20 _Torana482HP_

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Posted 03 June 2006 - 08:16 AM

Me mate that im buying my 308 off says this engine was always a freak, he ran a Annular 750 DP, has forged pistons and the works, says he got over 450 HP, headsz flowed 482HP, reved 2 8500 and could do 7500 all day.

Well we will see how it goes when i get it!

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#21 _Lostit_

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Posted 03 June 2006 - 02:39 PM

Bench racing and actually times is 2 different things.. lots of people have 500hp motors but when they actually run them they reaally find they barely can crack a 14sec pass.

As for max hp , really depends how much cash and how streetable you want .

As for my old one smallish cam 286H crane forged pistons, 750dp ran a 13.7/105mph at 6050rpm in second gear , single wheelie 3.36 rear end. With proper traction, and gearing a high 12 is in order.. but i only guess if the pollution gear and roller cam was used, and upped the comp to take premium unleaded.

Guessing its making 300ish Hp but on the street was fairly quick when it hooked up.. had the heads flowed to 400hp, but it did only get 150km/60 litres.

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#22 _1QUICK LJ_

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Posted 18 April 2009 - 05:14 PM

around 500hp is quite feasable

Edited by 1QUICK LJ, 18 April 2009 - 05:15 PM.

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#23 _Bomber Watson_

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Posted 19 April 2009 - 11:37 AM

Seems to be a bit of contradiction in this thread.

First post says maximum HP with x parameters.

Then the rest of the posts are shunning huge dollar motors.

What do you want, max HP or not?

Cheers.

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#24 yel327

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Posted 19 April 2009 - 11:53 AM

Just out of interest, but not off- topic, what were last of the Holden V8 5L engines pulling hp wise in V8 supercars? I think Larry Perkins was the last one running them before the change to the Chev engines.

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#25 _Allports_

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Posted 19 April 2009 - 04:13 PM

Seems to be a bit of contradiction in this thread.

First post says maximum HP with x parameters.

Then the rest of the posts are shunning huge dollar motors.

What do you want, max HP or not?

Cheers.

and that shows you why you dont build motors for thalydimide victims.