INLET SIZE VARIES

ZOMBIE · Post by **ZOMBIE** » Sat Jul 09, 2005 7:30 pm

How come the ports on a 1litre inlet are bigger than the ports on a 1.3. Im in the process of boring out my coupe s inlet and am now reconsidering and just buying a 1 litre one and boring out the top face where it meets the carb.
More power bhp to be gained?? is my car restricted throught this??
HELP !!!!!!

Tahrey1043 · Post by **Tahrey1043** » Sun Jul 10, 2005 5:23 pm

shurely it's t'other way round???

polokris · Post by **polokris** » Tue Jul 12, 2005 8:41 pm

its true... unless i got a "Random" inlet...

1.0 on the bottom.... 1.3 on top

gaskit on 1.0

Gaskit on 1.3

carb hole on 1.3 (rubber gaskit on)

1.0 hole for Carb... (rubber thingy off)

proof!

Gareth_GT_Hatch · Post by **Gareth_GT_Hatch** » Tue Jul 12, 2005 11:11 pm

the 1.0 one is what all mk3 ones look like. (well they both have the big single hole) I never checked the port sizes when i swapped carb for injector wish i had now. My derby has some sort of single butterfly pierburg on it that would suit that manifold perfectly, but im not selling it.

Phoenix · Post by **Phoenix** » Wed Jul 13, 2005 4:40 pm

so does that mean with some modification you can put the inlet off a 1L onto a 1.3L

ZOMBIE · Post by **ZOMBIE** » Wed Jul 13, 2005 11:12 pm

What ive learnt:-
Apparently the 1.3 inlet will develop more torque as it has 4 individual small bore runners but will feel strangled at top end>the reason why the 1l one has bigger bores is so that it has a decent top end speed.
In theory any way!??
However I think the best mod is to just get a 1.3 inlet and port match the beginning of the ports to the engine so you dont sacrifice torque but will have beter gas flow into the head making the engine more powerful!
Thats what im doing anyway!

Phoenix · Post by **Phoenix** » Mon Jul 18, 2005 7:02 pm

wow thats good thinkin zombie!!!

might just have a go at that when my inlet comes off

Tahrey1043 · Post by **Tahrey1043** » Mon Jul 18, 2005 9:32 pm

specs for the 1.0 mk2 do suggest its a bit more peaky than the injection, which is a lot closer to the more grunt-focussed nature of both the carb and injection 1.3s.....

hmmm

you sir, have just blown my mind

ZOMBIE · Post by **ZOMBIE** » Mon Jul 18, 2005 10:39 pm

Tahrey1043...for your benefit mate...I was at the scrappys and was dismantling a 1l I when I realised that both the ports on the head and inlet matched but the ports are smaller... I think so I dont know if thats any help to you...?

Tahrey1043 · Post by **Tahrey1043** » Tue Jul 19, 2005 6:29 pm

nope still blown

you keep managing to come up with cool and amazing things that just baffle me completely zombers

matched, but smaller?

Tigz · Post by **Tigz** » Tue Jul 19, 2005 6:56 pm

I wish my one litre head, was 16v.
I would swap it over to the 1400 before fitting it.

Thats a great mod if it works.