what carbs for 1700 xflow and 2.0 st170 engine

[Escort Mk1 4 Door]

as above i got a 1700 xflow, fully rebuilding with, gp7 cam, ported 1600 gt head, unleaded converted, 3 angle valve seats, lotus double valve springs, basicly everythings new or replaced with upgrades, its not going to be a senceable driver by any means just about the go

 

with that basic spec whats carbs do people thing,

twin 40's

single 45

twin 50's

 

also doing another project running a carb converted st170 with vvt still working

 

what carbs do u think for that?

[Escort Mk1 4 Door]

any one whos running a xflow??

[puddy]

Did you ever find out what spec the 'GP7' cam was ?

 

For the x flow, unless its a FULL race engine , twin 40's will suffice,

 

I have a 1660 x flow in my tina, ported head,1300 hi comp pistons,BCF3 cam,

 

and I am running single 32/36 on mine,might gain a few more bhp with

 

side draughts , but I prefer to be able to go places in it @ 30mpg.

 

Puddy

[Davewrc]

Twin 40's will be good for the x-flow and twin 45's for the zetec but they have have the 5th progression hole otherwise it will have a flat spot.

[Escort Mk1 4 Door]

i know the cams one of george polly spec

think its on spec with a6 cam max lift alowed by the cam bearing height hardly any dueration

[Escort Mk1 4 Door]

okay so 40's for the xflow any one had any dealings with a single 45 as i can get one with manifold aswell

 

and would 50's be to much for the st170 engine?

[Mrs O/H/C]

We have used twin 40s and twin 45s on our X.Flow. I would say for economy and performance twin 40s are adequate

[Escort Mk1 4 Door]

economy whats that? power

[Davewrc]

St170 would be better on throttle bodies. I don't think a pair of carbs would push the power much over stock. I'm thinking of building one next and using the stock TB and ecu, 170hp and VVT for free with no setup required is fine by me.

[Escort Mk1 4 Door]

im not looking for a up in power as such with the st170 engine, but if i drop carbs on it bar making one engine mount and fitting a elecy fuel pump in plug and play

 

so peoples oppion on a single 45 carb on a 1700 xflow got to let the guy know tonight if not anyone got a manifold for my 40's to go on

[lead foot]

Use twin 40s

[cdeane74]

ive got the 4 hole 45s on my st170 and cant even notice flat spot and had a 1640 xflow on 40s which ran nice too

[Escort Mk1 4 Door]

thanks for the input just need to fine a suitable manifold now (for both sides) exhaust has snapped yet again.

 

abd some 45's to dump in my mk5 st escort hehe

[Toby]

Twin 40's always are better for performance on a tuned engine (if set up) than a twin choke or single carb.

 

An A6 cam is more about duration than lift compared to the modern grinds ie 244, 254, 264 are high lift, short (relative to old A grinds) duration. If you google Kent Cams they have a lot of their specs on line for reference.

 

If it's your exhaust manifold that keeps breaking on the crossflow there is a very effective fix. Make a clamp that goes around the down pipe nears the engine and take it across onto one of the gear box bolts (usually the one on the sticky out lug). Peco used to supply these as standard with their manifolds and it was THE fix.

[puddy]

Twin 40's always are better for performance on a tuned engine (if set up) than a twin choke or single carb.

 

An A6 cam is more about duration than lift compared to the modern grinds ie 244, 254, 264 are high lift, short (relative to old A grinds) duration. If you google Kent Cams they have a lot of their specs on line for reference.

 

If it's your exhaust manifold that keeps breaking on the crossflow there is a very effective fix. Make a clamp that goes around the down pipe nears the engine and take it across onto one of the gear box bolts (usually the one on the sticky out lug). Peco used to supply these as standard with their manifolds and it was THE fix.

 

The master has spoken .

 

puddy

[Escort Mk1 4 Door]

ill stick some pics up of the cam when i pull it out from mock up and the problems im having with the manifolds are they keep breaking between 1 and 4 on the joint at the top

[Toby]

Twin 40's always are better for performance on a tuned engine (if set up) than a twin choke or single carb.

 

An A6 cam is more about duration than lift compared to the modern grinds ie 244, 254, 264 are high lift, short (relative to old A grinds) duration. If you google Kent Cams they have a lot of their specs on line for reference.

 

If it's your exhaust manifold that keeps breaking on the crossflow there is a very effective fix. Make a clamp that goes around the down pipe nears the engine and take it across onto one of the gear box bolts (usually the one on the sticky out lug). Peco used to supply these as standard with their manifolds and it was THE fix.

 

The master has spoken .

 

puddy

 

Lol - Yes there's not much I haven't broken!

[Toby]

ill stick some pics up of the cam when i pull it out from mock up and the problems im having with the manifolds are they keep breaking between 1 and 4 on the joint at the top

 

It's all the vibration off the engine and the whole system is only supported at the head and at the axle - it's no wonder really!

 

The manifold to gear box clamp will stop it mate.

[Escort Mk1 4 Door]

mine didnt fit with that bracket i might weld a mount on the car up the front.

 

i have always had to pull the manifold out to get it to bolt on as there always to close together on 1 and 4 and think its the stress

[Fiesta Steve]

45's on a crossflow with 36mm chokes

[deadly456]

I ran a 1700 xflow on short circuit tracks with a 40 dfa and it was so reliable its unreal

[harris horse power]

i have a pair of weber 40s on a xflow manifold for sale if your intreasted?

 

simon

[Escort Mk1 4 Door]

i got 40's in my shed jetted for a 130bhp camed cvh just need a manifold for them mate thanks for offer tho