rebuild

[Anonymous]

well im nearly finished uni for the year, and i will be on good money for a few months before i go back to parttime work and studies, and as a few of the aussies may know iam thinking of giving my motor a birthday.

XECUTE helped me out with what bits to put in it, but my motor has a reco head on it and if i was to get it ported (250 alloy xflow) does anyone who has had this type of work done have an idea of what a reputable machine shop would be likely to slug me and wether its worth doing it, i am considering the cam that XECUTE suggested a 280 with 215 onit , and a 465 carb or a 4bbl rochester and modified intake as the main mods, i am still considering what pistons and am not totally sure whether stock or flatoppers, i think i may stick with stock style pistons as the head may (im not sure at this stage) have been shaved a bit.

i am only aiming for a moderate amount of power increase, maybe 160 to 180 kw , cheers people

 

[addo]

Well, are you entering it in any of the usual categories - feral, town ute, whatever? What about a gear drive for max sound effect, and straight through headers with a fat side pipe?

Roller rockers will make the exhaust crisper; porting is probably overspending in your situation; balance the bottom end nicely and get the dizzy recurved/rebuilt for sure. They are all pretty ancient by now. A Crow 14770 cam is nice but may be overdoing it.

 

[Anonymous]

cheers addo, im kind of going feral the feral look , the exhaust will be rather cool i think , a set of headers, a cat conv with a pipe through it and a 18 inch hot long dog (2.5 in dia), this is going to come out justin front of the back wheel and should be lou d and proud. should stir pedestrians up as i come through vic park double clutching!!!

 

[66Sprint6]

Hey Recker,
What IS double clutching. I looked into it ahile ago and it always seems to be that when you are goin to downshift, you push in the clutch and take the stick out of gear, let out the clutch and rev the motor slightly, then pus in the clutch again and put it in gear. Its to sync up somethin or other, but I was wondering if thats what it was or if I was WAY off?
Matt

 

[CobraSix]

http://www.driversedge.com/dblcltch.htm

I often wondered this as well, but I think most people do it normally. It seems that it is just reving the engine when you downshift. Personally, if I'm downshifting to accelerate, I do it all at the same time as I clutch in and shift to the lower gear by just giving it some more gas.

Slade

 

[Anonymous]

its a changing technique you use usually in trucks that have non synchro boxes, this is normally used for some specific changes (esp down shifts, but also some up) i think it just puts the relevent cogs into the right place usually you can get away with letting it roll for a bit, but it depends what youre doing. in my ute i do itsometimes because it sounds pretty cool giving it a wad in nuetral, a car i used to have you had to dbl clutch 2 to 3 cos it was very sticky (i think there was something wrong with the syncro cone, in the ute sometimes i do do it downshifting when youre giving ut shit on the road cos i waas told it releives stress on teh components in teh box.

 

[66Sprint6]

oh ok,
thats what I figured it was, but I wanted to kinda clear that up. I have an automatic so it really doesnt matter, lol, but when Im in the jeep its alot of fun.
Matt

 

[Anonymous]

When dealing with a shifting tranny, you have 3 speeds that need to line up. You have your engine speed, you have your input shaft speed and you have your output shaft speed. When you shift, you push in the clutch, that disconnects the engine from the input shaft. When you pull it out of gear, the input shaft and the output shaft are disconnected. During this time, the engine is dropping speed and the input shaft is dropping speed. This is good. The problem being, the input shaft slows down quickly and on an old box there were no synchros. Synchros is like a little clutch for each gear that speeds up the input to match the output (at the gear. Not the same speed (unless in 1:1) but you know what I mean) which lets the gears mesh without grinding. Without a synchro, you have to line up the speeds just right. When you do a real double-clutch you reconnect the engine and input shaft and rev the motor up to match the input and output, then clutch again and drop it in gear. Once the input and output are connected (aka, it is in the lower gear) then you release the clutch and go on your way.


-=Whittey=-

 

[broncr]

That's what I was always told double clutching was - clutch,pull out of gear, release clutch,... then clutch, shift into next gear, release clutch.
I had a friend in High School who's dad restored Hudsons. He was only allowed to drive them if he used this method of double clutching.

For a while there I was wondering...

 

[Anonymous]

double clutching is what I have to do to the poor old 4spd in my XD to get second without a hugh CRUNCH at anything over ~ 40km's

 

[Anonymous]

whats ya synchro gone?

 

[Anonymous]

yeah i think so, very tired anyway. or its low on oil since it happens more when its warmed up.

 

[Anonymous]

A note.
Just watched my copy of Bullit. The Steve McQueen movie. He double clutches on the up changes in the chase scene and it drives me around the twist.
Does anybody else use this on the up change?
I have used this on down changes with dodgy gear boxes but not up changes.
Noel.

 

[Asa]

......
quick thought:
you're picking on this detail instead of the fact that there are 19 up-shifts in a row?

 

[Anonymous]

I didnt actually count the up shifts.
But it was" look,look,he's done it again"
Pointing frantically and bouncing on the chair.
I pointed this out to some mates and they also notice it.
Noel.
"Gotta get some thing else to do"

 

[Anonymous]

Double clutching is used for boxes that dont have syncros!!

You can also drive a box like this without a clutch, but its a little noisier

I often shift my van with out using the clutch using the throttle to adjust revs to suit speed in the desired gear.

or something??


CamZH