i know there are HEAPS of variables in how fast a car can go but i was wondering if anyone can give me a ROUGH idea of what kinda times i could get? its a 1972 LJ.
HP block
bore size: 3.665 inches
capacity: 190 cubic inches
stroke: standard 186
compression ratio: 9.2:1
balanced
pistons: ACL flat tops
rings: ACL moly
starfire rods
ARP rod bolts
ACL bearings
LC XU1 spec cam
powerboss hydrolic lifters
street terra roller rockers
ACL gaskets
350 4 brl holley
celica 5 spd
like i said i realise how hard it would be to answer such a question, its just that i'm bored and always wondered how hard it could go. (and to anyone who is thinking "drive it and find out" i would but its still a good few months off being on the road )
any idea how fast my car could go?
Started by
_lexa_
, Mar 19 2006 06:31 PM
3 replies to this topic
#1 _lexa_
Posted 19 March 2006 - 06:31 PM
#2 _Bomber Watson_
Posted 19 March 2006 - 06:40 PM
mate, mine in its current spec runs out of steam around the 100mph (160km/h) mark (still climbing but very slowly), if you couldent get 120mph (200km/h) from that i'd be suprised.. what diff gears are you running???
#3 _Keithy's_UC_
Posted 19 March 2006 - 06:50 PM
As mentioned above, what diff gears... To give you an example, my UC with a HP block, 4speed, 3.08:1 diff, very similar spec motor to yours (slightly more agressive cam and lots of headwork) runs a 14.8 1/4 mile, ive taken it past 160km/h (100mph) and had plenty of room for more.... If your asking about top speed, i rekon close to 200km/h with the same diff ratio as mine, but again, it all depends on conditions!
Im running an XU-1 Bathurst cam (what they used in the race cars), Hypatec flat top pistons and my compression is about 10.6:1. Mine's a 186 bore, i'm running the same rods, bearings and piston rings as you, same carby, same gaskets and same rockers...
I would estimate you would be at least in the 15second 1/4 mile times... If your diff ratio is less than mine, probably close to 14's, if your running 3.9:1 diff, well and truly 14's...
Keith
Im running an XU-1 Bathurst cam (what they used in the race cars), Hypatec flat top pistons and my compression is about 10.6:1. Mine's a 186 bore, i'm running the same rods, bearings and piston rings as you, same carby, same gaskets and same rockers...
I would estimate you would be at least in the 15second 1/4 mile times... If your diff ratio is less than mine, probably close to 14's, if your running 3.9:1 diff, well and truly 14's...
Keith
#4 _CHOPPER_
Posted 19 March 2006 - 09:20 PM
This is a formula I stumbled across over 15 years ago.
V = ( cube root ) ( 59489 x Kw ) / ( Cd x A )
Kw = Engine output in Kw
Cd = drag coeffient
A = cross sectional area of vehicle in Sq metres.
So for a 100 Kw LJ ( which has a Cd of around 0.45 ) the formulae works out as:
( cube root ) ( 59489 x 100 ) / ( 0.45 x A )
I don't have the cross sectional area of an LJ handy, so somebody else can fill in the blank.
V = ( cube root ) ( 59489 x Kw ) / ( Cd x A )
Kw = Engine output in Kw
Cd = drag coeffient
A = cross sectional area of vehicle in Sq metres.
So for a 100 Kw LJ ( which has a Cd of around 0.45 ) the formulae works out as:
( cube root ) ( 59489 x 100 ) / ( 0.45 x A )
I don't have the cross sectional area of an LJ handy, so somebody else can fill in the blank.
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