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#1 Down Port Heads
jared Posted on: 2007/7/3 1:42
would anyone have any ideas on downporting a race 1400 GX to a race 1298cc engine. if its wort while and how?


#2 Re: Down Port Heads
ddgonzal Posted on: 2007/7/3 4:51
Downporting? I think they call it "de-stroking".

The A14 is a lot heavier than an A13 works racing engine. Most racers start with A12 and bore it out to make 1300 cc class engine -- some blocks can do it. The north american A12A block is even better and can always be bored to that size. Both are lighter than A14.


#3 Re: Down Port Heads
A14force Posted on: 2007/7/3 5:06
Whereabouts in NZ are you?


#4 Re: Down Port Heads
stirlingmac Posted on: 2007/7/3 7:17
Ring Tony at Marsh Motorsport in Auckland, or Brendon at CSL in Palmerston North, and they will explain whats involved and how much it will cost. Tony will probably suggest a more traditional style of porting that works just as well.


#5 Re: Down Port Heads
LittleFireyOne Posted on: 2007/7/3 9:37
why not stick some massivley over sized sleves in the bores to bring them back down to the old A12 specs? suppose you would have to changew the rods and stuff aswell to accomodate the pistons so probly not


#6 Re: Down Port Heads
jared Posted on: 2007/7/4 0:55
I am in Auckland the car is ChCh where it has always raced. Black 1200 coupe


#7 Re: Down Port Heads
jared Posted on: 2007/7/4 0:57
Thanks. I dont think to many people have heard of a down ported head. Auckland, Car is in Chch where it has always been raced. black 1200 coupe


#8 Re: Down Port Heads
jared Posted on: 2007/7/4 1:00
Cheers for reply, but a downported head is when you block the ports up with alloy weld and then bore down on a angle through the top of the head(sleaved) about a 20 degree or so angle. apparently 30Bhp right there.


#9 Re: Down Port Heads
sidedraught Posted on: 2007/7/4 1:56
Quote:
a downported head is when you block the ports up with alloy weld and then bore down on a angle through the top of the head(sleaved) about a 20 degree or so angle. apparently 30Bhp right there.


So thats what downporting is, glad you cleared that up, your first post below,read to me like you wanted to decrease the engines capacity from 1400cc to 1298cc.

Quote:
would anyone have any ideas on downporting a race 1400 GX to a race 1298cc engine.



#10 Re: Down Port Heads
short-coupe Posted on: 2007/7/4 4:38
i have seen a 1600 Kent engine (escort) that had down ports, i guy in england was doing them, can't remember his name, he released a few books about hi-po 4cyl ford motors etc



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