the 308 with 488fwhp, with a 950 carb, it would be very lazy or flat in low rpm. it sounds like a straight drag engine.
i could compare some strokers i know againest the one you have commented on oldjohnno, but this is a 308 threah haha.
a number of years ago there was a company in perth BRE, they built a 308 for circuit racing, which from memory made about 430rwhp, i dont no the exact specs on it. the engine was injected using harrop manifold and 4 barrel throttle body, dave bennet alloy heads.
308 Engine combos and HP figures
Started by
Redslur
, Sep 06 2011 12:55 PM
206 replies to this topic
#26
ozyozyozy
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Posted 10 September 2011 - 11:10 AM
#27
_WhiteKnight_
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Posted 10 September 2011 - 02:32 PM
i havent had my car dynoed yet but the lil 308 slap job goes alright
red 308 standard bore flat top high comp pistons crow 5603 cam i think
red pre pollution heads and manifold all matchported at home slightly tweaked quaddy shitbag extractors with twin 2 1/4 system bosch hei dizzy with summit 6al style ignition
with the old banjo and the 13s it ran a best of 14.7 @98mph with heaps of wheel spin having open centre and 205s
plannign to get back to the track as soon as i get some big wheels now its got a 9 inch 3.5gears truetrac
Mine is more the same as MR5000 the only differance is that mine is a stock engine (its all in the tune)
cheers keith
#28
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Posted 10 September 2011 - 03:01 PM
Old 308.
Std bore approx 10.3 comp
crane 286 with stock rocker gear
Minor "pocket" ported heads
edelbrock performer and tri-ys
GRA straight gas
193 kw at wheels.
Its a problem as always trying to compare HP figures as there are so many "happy" dynos out there.
It takes a lot less moroso hp than many of the figures mentioned here to get a LH/LX into the 11s.
Readers of Bob Kotmels column may remember many years ago he wrote about a very simple 308 build which consistently put a square torana into the 11s. I think it was in his performance street car magazine days.
From memory the basics were stock bottom end and comp.
Minor bowl ported red heads, solid cam about 255 at 50 thou duration, single plane manifold and 650 dp holley.
Ran a glide and 3.9 torana diff.
Std bore approx 10.3 comp
crane 286 with stock rocker gear
Minor "pocket" ported heads
edelbrock performer and tri-ys
GRA straight gas
193 kw at wheels.
Its a problem as always trying to compare HP figures as there are so many "happy" dynos out there.
It takes a lot less moroso hp than many of the figures mentioned here to get a LH/LX into the 11s.
Readers of Bob Kotmels column may remember many years ago he wrote about a very simple 308 build which consistently put a square torana into the 11s. I think it was in his performance street car magazine days.
From memory the basics were stock bottom end and comp.
Minor bowl ported red heads, solid cam about 255 at 50 thou duration, single plane manifold and 650 dp holley.
Ran a glide and 3.9 torana diff.
#29
_LH8VD69_
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Posted 11 September 2011 - 02:10 AM
Personally Id like to know all kinds of 308 power combos. Strokers included. It just gives any would be engine build up idea some other option to look at.
Cheers
Cheers
#30
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Posted 11 September 2011 - 02:55 AM
Personally Id like to know all kinds of 308 power combos. Strokers included. It just gives any would be engine build up idea some other option to look at.
Cheers
Start another thread if you want wank strokes included i would like to see HP graphs asthey tell the complte story .
The wank strokes graphs ive seen are all finished by 4g
Edited by outer control, 11 September 2011 - 02:59 AM.
#31
308 Sunbird
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Posted 11 September 2011 - 10:14 AM
^^ I agree, keep figures to 308 & state at what revs.
#32
_Mint_
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Posted 11 September 2011 - 12:00 PM
the 308 with 488fwhp, with a 950 carb, it would be very lazy or flat in low rpm. it sounds like a straight drag engine
i agree..the thing would be a bit of a mungrel..dang a 950 carb it aint gunna run out of fuel in a hurry..but would probly have zero vacum down low
#33
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Posted 11 September 2011 - 01:46 PM
It is what it is - I don't think it's reasonable to expect an N/A 488hp 308 to be the ideal engine for Uncle Les to tow his caravan. Having said that, the cam isn't over the top for a streeter (I've had bigger cams in baby sixes on the street) and so long as it was driven sensibly - ie. don't expect it to like WOT at 2500rpm - I think it would be OK. Especially considering that it's capable of high 10s/11 flats with half decent pipes. And if you wanted to sharpen the bottom end a little for street driving you could always throw on something like a 3310 and use the 950 for strip duty. It's only a few bolts after all.
#34
Redslur
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Posted 11 September 2011 - 06:34 PM
Good combos there for sure. When on the dyno my power turned over at 6000rpm. Even thought the cam is supposed to produce power to 6500rpm I think the dual plain performer started running out of puff...
Keep em coming lads....
Keep em coming lads....
#35
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Posted 11 September 2011 - 06:55 PM
my 308 i used to have in my lx hatch was 20 up flat tops 15thou over deck,heavily ported hq style heads, solid cam custom grind, crane rollers, avgas, bosch recurved dizzy, 2x 575 demon carbs nothing really outrageous it made 246kw at the tyres at 7000rpm and was very drivable.
the engine before that was a fairly wild little 253 it made 306hp at the tyres.
i miss that 308
the engine before that was a fairly wild little 253 it made 306hp at the tyres.
i miss that 308
#36
Redslur
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Posted 11 September 2011 - 07:45 PM
^^^^Bloody good effort on both accounts!
#37
_outer control_
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Posted 11 September 2011 - 11:12 PM
Standard l34 rods pistons balanced brookfield sump L34 heads ported by toranamuk solid cam l34 maifold and exhausts l34 dissy 2x 45 dcoe webers
=232.9 kw at back wheels at 6,800 rpms Have not seen many standard A9X motors around these figures RED as this apart from cam, porting , webers is stock L34 engine
=232.9 kw at back wheels at 6,800 rpms Have not seen many standard A9X motors around these figures RED as this apart from cam, porting , webers is stock L34 engine
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Edited by outer control, 11 September 2011 - 11:17 PM.
#38
_Mint_
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Posted 12 September 2011 - 12:36 AM
nice numbers..about 310 neddies at wheels..what are the cam specs ? or dont you want to tell us
#39
_outer control_
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Posted 12 September 2011 - 06:09 AM
nice numbers..about 310 neddies at wheels..what are the cam specs ? or dont you want to tell us
It was a speco grind bought about 15 yrs ago out of parts pedlar it was suppossed to be a spare for the gougwn hindau team for bathurst 75
had clive doctor it before we used it so i have species put away so it can be copied
#40
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Posted 12 September 2011 - 12:29 PM
Good results there Wayne. I guess for that extra bit of grunt the solid cams are the way to go. I chose to go for a largeish hydraulic as I wanted something quite driveable with the M21. I am sure with a good solid I would get more HP too. How was that combo to drive? Is it more a race engine or good on the street too?
#41
_The Baron_
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Posted 12 September 2011 - 05:12 PM
Bah!!
My Statesman engine which was built by the same bloke and topped with a rochester made 233.1 killer wasps at the baggs.
Didn't need to rev the franger out of it either!
My Statesman engine which was built by the same bloke and topped with a rochester made 233.1 killer wasps at the baggs.
Didn't need to rev the franger out of it either!
#42
_outer control_
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Posted 12 September 2011 - 05:25 PM
Bah!!
My Statesman engine which was built by the same bloke and topped with a rochester made 233.1 killer wasps at the baggs.
Didn't need to rev the franger out of it either!
You could have a 700 hp stato engine but with a rev range of 1500-2000 rpm useable your not going to win bathurst Baron.
No mega crank just a useable engine and dont put that rotty down Gricey won bathurst in 85 with one.
Could have gone mega crank too but kept it period.Very tractable will idle [not smoothly] under 1000rpm but is a race engine really
Edited by outer control, 12 September 2011 - 05:27 PM.
#43
_HRV74_
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Posted 12 September 2011 - 08:29 PM
Good stuff Gerry (take me for a spin please!)
Sounds almost identical to the 308 combo that I used a while ago - same cam, & single 3" exhaust. I'm sure your heads are superior though. Mine made 361hp at the fly. I don't think the dual plain manifold would be a problem. My engine builders preference would have been the Performer. I ended up using a single plane Torker (not out of choice - that's what I had at the time) and the thing made max power at 5750rpm through a single 3" exhaust. Using a dual exhaust on the engine dyno it made slightly less peak power and at higher revs - 355hp at 6250rpm.
I used to rev the thing to 6700rpm at the strip with no probs, but only because the shitty powerglide kinda made it necessary. It's going to be loads of fun behind a 4-speed!
Sounds almost identical to the 308 combo that I used a while ago - same cam, & single 3" exhaust. I'm sure your heads are superior though. Mine made 361hp at the fly. I don't think the dual plain manifold would be a problem. My engine builders preference would have been the Performer. I ended up using a single plane Torker (not out of choice - that's what I had at the time) and the thing made max power at 5750rpm through a single 3" exhaust. Using a dual exhaust on the engine dyno it made slightly less peak power and at higher revs - 355hp at 6250rpm.
I used to rev the thing to 6700rpm at the strip with no probs, but only because the shitty powerglide kinda made it necessary. It's going to be loads of fun behind a 4-speed!
#45
Redslur
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Posted 12 September 2011 - 09:27 PM
Hi Harve. Will take you for a run for sure. Somehow I think I have pushed the limits with the old M21 :-) We will see how it holds up I guess...It has been seeing regular snaps to 6500 rpm lately...LOL. So much for running it in gently.
#46
_HRV74_
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Posted 13 September 2011 - 05:37 PM
Running it in? What is this concept that you speak of?! 
#47
_SLR Goat_
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Posted 13 September 2011 - 06:13 PM
My 308 combo
-standard stroke crank
-l34 X rods
-acl race series pistons
-crane 288 solid cam
-ported and polished pre poll red heads
-stripmaster manifold
-750hp carb
-msd ignition
-11:1 comp ratio
unknown HP as i havent had it dynoed any guesses?
-standard stroke crank
-l34 X rods
-acl race series pistons
-crane 288 solid cam
-ported and polished pre poll red heads
-stripmaster manifold
-750hp carb
-msd ignition
-11:1 comp ratio
unknown HP as i havent had it dynoed any guesses?
Edited by SLR Goat, 13 September 2011 - 06:13 PM.
#48
Redslur
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Posted 13 September 2011 - 06:46 PM
I'd be interested to see too. The old 288 solids are a good cam with the VN heads, haven't seen too many with the red heads though...I am sure it would make good power though. Anyone good for a guestimate?
#49
View GaragePosted 13 September 2011 - 07:41 PM
When you do the first burnout around the block you vary the revs between 6500 and 8000 just so you don't give it too much of a hard time...Running it in? What is this concept that you speak of?!
SLR Goat you have me interested there too.
#50
_SLR Goat_
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Posted 13 September 2011 - 07:57 PM
When you do the first burnout around the block you vary the revs between 6500 and 8000 just so you don't give it too much of a hard time...
Running it in? What is this concept that you speak of?!
SLR Goat you have me interested there too.
After the cam break in run thats how i ran mine in till lady of asian descent down the road got the shits and called the police
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