1.8 tuning and intake options

[robb]

Hi all,

I have a 1.8 just ready to go in to my new shell and was wondering what sort of power should I expect and what modifications to the intake can I do? (apart from time it up and tune the carb)
I have the usual crap and spare filters, tubing etc. lying around.

It's a 1.8 from a cav MK1 i beleive (not 100%)
Varajet II carb system (manual choke conv.)
1.2 box (so I was told, not checked it yet)

Also if anyone can give me a chassis no. from a car that should have one of these engines as std so I can get parts! Local Vaux are f***in useles!!

Thanks all

[Will F]

Just the usual things really matey, twin carbs, a nice cam and a 4 branch should see a few horses!

Are you still popping over on Sat?

[robb]

Yep,

I am trying to get a van as I need to cut a roof off!

If possible I would like to cut it about a foot down each pillar.

Robb

P.S. I'll just stick with the std block, carb, cam and exhaust but jam a filter on somehow.

[S_Gault]

Ive found a good few horse in past just by careful setup on the rollers.

I do every customers engine now on the dyno so i know its perfect.

Steven

[_JH_]

I think the 38 or 40 dgas weber carb is a common upgrade for the varajet. think a guy in my area has a 1.8 manta with that done. i'll ask him. there's plenty around in scrappy's too.

[S_Gault]

the dgas is for a 3.0L engine and has the chokes oopening together ,

the dgav is the 2.0L carb from the pinto and is the one to go for.

Or, a customer of mine is selling a brand new twinchoke 32/34dmtl replacement for the 2e3

Steven

[Snowface]

32/34 isn't really big enough for 1800.

[S_Gault]

Balls...

I build F2 engines and they give a solid 160bhp on the dyno running a twinchoke. And they are slightly over 2.0L

Steven

[Snowface]

yes but 32/34 are too small a choke sizes for a 1.8.

need more like 36/38 or even 40.

[S_Gault]

in order to say such a statement you need to know that its the choke that is restricting high lift flow, ( ie you need a flowbench) which it isnt in this case..

airflow is related to the power an engine makes regardless of the size of it.. Ive built 1700cc hotrods using a pair of 48s which need 8300rpm to make 180odd hp... yet std 2.0L PINTOS need 40s on 33mm chokes etc... you see the point.

A std 1800 doent have the airflow to need bigger chokes period. And if you dont agree I'll send you the flowbench figures.

Steven

[Dan]

dont worry about snowface, he normally argue's or gives false information by the knowledge of what he has been told or has read. We have had a few times like this before regarding other matters where he argued the toss against actual experience and hands on knowledge vrs wives tales etc.

[Snowface]

while i might give out a small bit of inaccurate information on here, i also give out a lot of accurate stuff that helps people. Its all in good heart.

Until that is someone (Hmmm?) comes along and starts swearing and F**king all over the place.