Outer Limits 4x4 Board

k well i have decided after much thought ill just rebuild my 3f motor that i blew up
ive broken something in the bottom end yet to get it all apart but its already got a reco head etc and few other things so it should be sweet but i need a new bottom end rebuild just wondering what sort of performance mods i could do to the engine?
im gonna get extractors and new exhaust but just thinking what other people have done to them?
going 2 go talk with r.p.m. engines as i no him but just to get some ideas

thankz brentz

3meters of chain and 47meters of rope

You're wasting your time trying to get decent power gains from a 3F without dumping lots of dollars doing efi and turbo mods as Matt has done.

I reckon if a conversion is off the cards then your best bet is to grab another 3F from a wrecker for probably under $500 complete and throw that in. They are a gutless motor but they do keep going if looked after.

If you MUST rebuild, shave the block/head for more compression, port match the maifolds, clean any casting dags etc in the ports fit new better shaped valves and a slightly better cam should give you a little more torque without breaking the bank, or just get another motor from the wreckers

yeah buy mind its got recod head its done 209,000 and goes well, you get everything with it i went to a 5 litre

brentz wrote:k well i have decided after much thought ill just rebuild my 3f motor that i blew up
ive broken something in the bottom end yet to get it all apart but its already got a reco head etc and few other things so it should be sweet but i need a new bottom end rebuild just wondering what sort of performance mods i could do to the engine?
im gonna get extractors and new exhaust but just thinking what other people have done to them?
going 2 go talk with r.p.m. engines as i no him but just to get some ideas

thankz brentz

pull the 3f and chuck in a 2f

Jes

turbo it

http://forum.ih8mud.com/40-55-series-te ... roopy.html


100% stock motor apart from a reco head with lpg inserts o and the turbo

i dont know about them being gutless when i picked my middi the old 3f (which i didnt know at the time) had a burnt out valve on no. 3 pots and blown head gasket between 3 & 4 it sounded like a lister engine but it still held 120ks no worries and came up the gap in 4th at 60k/ph and didnt get hot so thats not bad in my opinion thats not bad and they are rated at 110kw

jessie928 wrote:

brentz wrote:k well i have decided after much thought ill just rebuild my 3f motor that i blew up
ive broken something in the bottom end yet to get it all apart but its already got a reco head etc and few other things so it should be sweet but i need a new bottom end rebuild just wondering what sort of performance mods i could do to the engine?
im gonna get extractors and new exhaust but just thinking what other people have done to them?
going 2 go talk with r.p.m. engines as i no him but just to get some ideas

thankz brentz

pull the 3f and chuck in a 2f

Jes

and lose power and torque? why? unless you rebuild a 2F with more comp to give it more torque than a 3F

3f head on 2f block ?

hulsty wrote:

jessie928 wrote:

brentz wrote:k well i have decided after much thought ill just rebuild my 3f motor that i blew up
ive broken something in the bottom end yet to get it all apart but its already got a reco head etc and few other things so it should be sweet but i need a new bottom end rebuild just wondering what sort of performance mods i could do to the engine?
im gonna get extractors and new exhaust but just thinking what other people have done to them?
going 2 go talk with r.p.m. engines as i no him but just to get some ideas

thankz brentz

pull the 3f and chuck in a 2f

Jes

and lose power and torque? why? unless you rebuild a 2F with more comp to give it more torque than a 3F

ehem,

what you loose in torque and HP in the upper range for a 2f you GAIN in down below where you need it.
a 3f makes is HP and power high in the rev range, a 2f has bucketloads of power down low.

" there is no replacement for Displacement!

JEs

ok to be specific, here are some figures

2F 4230 135@3600 210@1800
3F 3955 155@4000 219@3000

a 2f in a offroad truck will wipe the floor with a 3f anyday.

here is a handy site for specs

http://www.off-road.com/trucks4x4/artic ... ?id=264200

Jes

3f had no dramas pushing a 60 series along at ludicrous speed on stockton beach plenty of power to be had there

thanks guys im gonna see what i can do trust me not by choice of rebuilding this motor or sticking with a 3f its just that only other engine i would go would be a v8 and $1100 and loss of license on p plates aint appealing to me

if you really wanna go v8 just throw in a 2nd hand junker 3f or 2f and make it last till you can legally fit the v8