Hey all ive purchased a red 308 motor that has been freshly rebuilt and has not been started and run in yet.
Can anyone give a rough estimate on performance/power at the flywheel compared to a standard 308 from factory? (eg LX SL 5.0 Torana)
new internal parts are
Hypatec pistons
Hastings rings
King main bearings
King conrod bearings
Durapro cam bearings
Rollmaster double row timing chain kit
Powermax cs-913 camshaft (2000-4800)
Speedpro lifters
L34 inlet and exhaust valves
K-line valve inserts
CHEV LT1 valve springs
Crankshaft grinded and balanced,
Honed and rebored,
rebuilt 4 barrel quaddy, standard points dizzy, standard inlet/exhaust manifolds, twin thermos.
It will be a while before i have my car complete and running.....
The car will be intended for sunday cruising no drags.
Cheers
Dorzy
308 engine rebuild gurus
Started by
_TRRANA_
, Jan 05 2011 08:34 PM
12 replies to this topic
#2
rodomo
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Posted 05 January 2011 - 08:58 PM
Can anyone give a rough estimate on performance/power
Powermax cs-913 camshaft (2000-4800)
Speedpro lifters
L34 inlet and exhaust valves
CHEV LT1 valve springs
rebuilt 4 barrel quaddy, twin thermos.
Not a lot there to increase HP. I would say standard +20? It should rev a little harder than standard and be reliable too.
#3
Guns n roses
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Posted 05 January 2011 - 09:04 PM
deffintly piss off the standard manifolds and dizzy and run a elect dizzy,a edelbrock manifold and some extractors
#4
_nemo355v8_
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Posted 05 January 2011 - 09:07 PM
With out cam specs and compression ratio its a hard to tell.
#5
TerrA LX
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Posted 05 January 2011 - 10:15 PM
As above, all the mods in the world will not gain much if the compression ratio is not matched to the combination and HEI dizzy/coil will give a far better increase.
#6
_Tuflx8_
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Posted 06 January 2011 - 07:41 AM
Sounds pretty similar to my set-up which I have just completed in my LX sedan. I have taken it to Lakeside performance in Melbourne to get dyno tuned but they told me to piss off the Quady and replace it with a Holley 650, put a set of adjustable roller rockers on it and put a 3000 stall converter on the turbo 350. Once this is all done, they said I should expect something around 350+ hp. It has already broken a rocker and bent a pushrod which may be due to high compression but other than that, the car runs fine at the moment. I will post some pics soon.
#7
_sbc57lx_
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Posted 06 January 2011 - 03:19 PM
To hard to give a close estimate, as other have stated....
Who makes these powemax cams ?, NEED THE SPEC'S a cam starting it's power curve at 2000, should end nearer to 5200 - 5500
For a rough guide , an engine I had in a VK Calais Auto : fresh rebuilt 308, mild cam ( 1200 - 5000 ) mild porting, LT1 springs flat top pistons ,
recurved STD elect dizzy, and turned Quaddy ( almost what your engine is ?? ) was dynoed at 200 HP, at the rear wheels ,
So , I'm guessing yours , 220 - 240 HP @ the fly wheel.
Who makes these powemax cams ?, NEED THE SPEC'S a cam starting it's power curve at 2000, should end nearer to 5200 - 5500
For a rough guide , an engine I had in a VK Calais Auto : fresh rebuilt 308, mild cam ( 1200 - 5000 ) mild porting, LT1 springs flat top pistons ,
recurved STD elect dizzy, and turned Quaddy ( almost what your engine is ?? ) was dynoed at 200 HP, at the rear wheels ,
So , I'm guessing yours , 220 - 240 HP @ the fly wheel.
#8
xu1kid
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Posted 06 January 2011 - 04:50 PM
Sounds pretty similar to my set-up which I have just completed in my LX sedan. I have taken it to Lakeside performance in Melbourne to get dyno tuned but they told me to piss off the Quady and replace it with a Holley 650, put a set of adjustable roller rockers on it and put a 3000 stall converter on the turbo 350. Once this is all done, they said I should expect something around 350+ hp. It has already broken a rocker and bent a pushrod which may be due to high compression but other than that, the car runs fine at the moment. I will post some pics soon.
i doubt that a high compression ratio will bend a pushrod and break a rocker sounds like a valve train issue ther something not right maybe valve spring binding,
#9
_Tuflx8_
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Posted 06 January 2011 - 05:49 PM
Sounds pretty similar to my set-up which I have just completed in my LX sedan. I have taken it to Lakeside performance in Melbourne to get dyno tuned but they told me to piss off the Quady and replace it with a Holley 650, put a set of adjustable roller rockers on it and put a 3000 stall converter on the turbo 350. Once this is all done, they said I should expect something around 350+ hp. It has already broken a rocker and bent a pushrod which may be due to high compression but other than that, the car runs fine at the moment. I will post some pics soon.
i doubt that a high compression ratio will bend a pushrod and break a rocker sounds like a valve train issue ther something not right maybe valve spring binding,
Had everything checked and tested since the broken rocker was discovered and everything seems fine. No valvetrain issues present. The guy from Lakeside said he has seen instances in the past where engines with a decent size cam and high compression ratio tend to break standard rockers as they are not made to withstand such extreme tolerances. Having said that, my guess is that the faulty rocker may have been ground down a little too much and eventually gave in under load as it only broke once I put in the inner valve springs after running in the cam!
#10
_bunkerjest_
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Posted 06 January 2011 - 06:09 PM
mate i would hit up Toryoda. whatever he would say I would take as gospel. that dude knows his stuff and is an awesome guy to boot. only ever too happy to help
#11
TerrA LX
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Posted 07 January 2011 - 11:05 AM
my guess is that the faulty rocker may have been ground down a little too much and eventually gave in under load as it only broke once I put in the inner valve springs after running in the cam!
Your combination sounds nothing like the original one posted in the first instance.
BTW your cam sounds too big for standard gear.
#12
_Tuflx8_
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Posted 07 January 2011 - 03:55 PM
my guess is that the faulty rocker may have been ground down a little too much and eventually gave in under load as it only broke once I put in the inner valve springs after running in the cam!
Your combination sounds nothing like the original one posted in the first instance.
BTW your cam sounds too big for standard gear.
I didn't mean that my engine was built to the exact specs as per the original post, what I meant was that I have done the same amount of work to my setup but with different parts and equipment! We all know that no 2 engines are exactly the same but we all can compare what we have done so others can learn from it. Is that not the purpose of these forums!!!!!
Also, as I have mentioned before, I am in the process of changing over the necessary parts in order to gain the maximum output from my engine, thus discovering the standard rockers are not suitable for my application. You know how it is.... trial and error!
#13
_Trentm_
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Posted 07 January 2011 - 05:54 PM
Hi mate, just had mine done here are the specs:
VK Black motor
308 + 30 thou
Electronic Bosch Dizzy.
Edelbrock Performer
4 BBL Rochester
Mild waggott cam .464 lift
Roller rockers
Standard valves, heads all cleaned up
10/10 crank
standard exhaust manifold with twin 2 inch exhaust.
Higher stall.
9:1 comp
3.08 banjo fine spline diff.
We estimated 250- 260 hp at the flywheel with about 430 NM torque. I will probably get some extractors next.
Good luck!
VK Black motor
308 + 30 thou
Electronic Bosch Dizzy.
Edelbrock Performer
4 BBL Rochester
Mild waggott cam .464 lift
Roller rockers
Standard valves, heads all cleaned up
10/10 crank
standard exhaust manifold with twin 2 inch exhaust.
Higher stall.
9:1 comp
3.08 banjo fine spline diff.
We estimated 250- 260 hp at the flywheel with about 430 NM torque. I will probably get some extractors next.
Good luck!
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