Jump to content

What bhp


S c o o b y

Recommended Posts

You might want a mild road cam in that to make the 40s work to the best of their ability. And the bhp will depend on how strong the engine is and how well the 40s are set up..............A rolling road session is aways a bonus!

Just wondering weather to go 1600 crossflow or pinto .

Link to comment
Share on other sites

2.0L Pinto is more powerful than a 1600 crosser

Tuning is another matter but again £ for £ Pinto is cheaper as you are starting with more capacity

 

Pinto easy wins are Injection head and thin gasket add an FR32 for an easy 135bhp

From here on its about how deep your wallet is

Link to comment
Share on other sites

Like everyone has said, how deep is your wallet. Met a guy when I was at the rolling road with a mk2 Mexico rep that was stunning, he was running well over 200 bhp, but he was chewing through gearboxes like no tomorrow. But it was a sweet motor, I think he is on here too, Kevin?

Link to comment
Share on other sites

Well I no I'm not going to get near the 350bhp I had with the scoob but I thought around 150 in a mk2 being lighter would be quite enough really . But I do like to see the cross flow in an escort I think they suit it really well and rev better don't they . Just thinking for the future really as I do like my power . Also I have gas flowed in an alloy head before so would be doing that my self , but not tried it in a steel head as I used a dremal grinder . It was a mk2 Astra 1.3 it did 40 in first 70 in second 90 in third and 125 in fourth it was a real screamer lol .

Link to comment
Share on other sites

2.0L Pinto is more powerful than a 1600 crosser

Tuning is another matter but again £ for £ Pinto is cheaper as you are starting with more capacity

Pinto easy wins are Injection head and thin gasket add an FR32 for an easy 135bhp

From here on its about how deep your wallet is

Is that on twin 40 webers or twin choke weber

Link to comment
Share on other sites

I run bike carbs, cheaper than Webers but manifolds are costing a bit now.

There is no easy route to power but you can make decisions early on that get best power per pound.

I know a lot about Pinto's but little about Crossflow and Zetec save that pound for pound it cost more to get 130 out of a Crossflow than a Pinto, Zetec is 115 to 164 as standard but fitting it has its own costs

  • Like 2
Link to comment
Share on other sites

Is that on twin 40 webers or twin choke weber

According to Burtons that would be with the 32/36 twin choke. You could get a 38DGAS though to up it a bit more instead of sidedraughts or bike carbs, it will fit the same inlet manifold as the 32/36.
  • Like 1
Link to comment
Share on other sites

As I recall 32/36 good for 135bhp

38 DGAS 150+

Twin 40's 150

Twin 45's 180

Twin 48's higher but don't work as well for low revs

It all gets a bit academic as twin webers have a choke limit 7mm less than the bore so 40's run 33 max choke, 45's 38mm Max

Bike carbs most have variable venturi and can be more flexible at low revs, I just match the carb outlet port to the head give or take a few mm

  • Like 1
Link to comment
Share on other sites

As I recall 32/36 good for 135bhp

38 DGAS 150+

Twin 40's 150

Twin 45's 180

Twin 48's higher but don't work as well for low revs

It all gets a bit academic as twin webers have a choke limit 7mm less than the bore so 40's run 33 max choke, 45's 38mm Max

Bike carbs most have variable venturi and can be more flexible at low revs, I just match the carb outlet port to the head give or take a few mm

Sorry not sure what 38 DGAS is is it a twin choke weber ? Thanks also do you need high lift cams to get that power plus gas flow etc ?
Link to comment
Share on other sites

The 38 is V similar to the 32/36. Except obviously the choke size is 38 and unlike the 32 both chokes open together as the throttle is applied, where as the 32 chokes open one at a time as the throttle opens until both chokes are fully operational. You can get away with a mild road cam I. E. 285 lift without gas flowing, but it can be never ending you end up chasing your tail. In the 80s I had a mk2 rs2000, with a single 45 dellorto on a lynx manifold, and along with that she had a piper 285 cam. Once I got her rolling road tuned she was well sweet, mind the single box Janspeed system was far to noisy especially as I was bringing her home to the UK from my work in Germany! Still I was young so it was all that I expected at that age!

  • Like 1
Link to comment
Share on other sites

The 38 is V similar to the 32/36. Except obviously the choke size is 38 and unlike the 32 both chokes open together as the throttle is applied, where as the 32 chokes open one at a time as the throttle opens until both chokes are fully operational. You can get away with a mild road cam I. E. 285 lift without gas flowing, but it can be never ending you end up chasing your tail. In the 80s I had a mk2 rs2000, with a single 45 dellorto on a lynx manifold, and along with that she had a piper 285 cam. Once I got her rolling road tuned she was well sweet, mind the single box Janspeed system was far to noisy especially as I was bringing her home to the UK from my work in Germany! Still I was young so it was all that I expected at that age!

I got you thanks so with an injection head if I can find one a mild cam 4 branch manifold 38 DGAS carb it should be 150 ish bhp ?

Link to comment
Share on other sites

I think 150bhp will need higher compression ratio with a 285 cam ( I consider this fast road) there are other good road cams that don't need big revs the FR30 high lift high torque the FR31 injection cam. Anything over 285 is getting marginal for road.

I've built 2 x 2.1's one was a bolt on job just parts matched from standard available stuff and one with cosworth rods V6 Pistons 10.7 to 1 and RL31

2 completely different engines on the road, the FR32 was no different from standard except it pulled like a train and revved for ever but power peaked at about 5800. The RL31 cam engine felt sluggish below 3000 then pulled very very well, I had an issue and it and I'll rebuild it later this year.

You can put a 130bhp together in a weekend then rolling road it, 150bhp really needs compression so head skim, more than 150 and you need rods and Pistons.

My biggest regret, I should have gone for forged Pistons not V6

  • Like 2
Link to comment
Share on other sites

I think 150bhp will need higher compression ratio with a 285 cam ( I consider this fast road) there are other good road cams that don't need big revs the FR30 high lift high torque the FR31 injection cam. Anything over 285 is getting marginal for road.

I've built 2 x 2.1's one was a bolt on job just parts matched from standard available stuff and one with cosworth rods V6 Pistons 10.7 to 1 and RL31

2 completely different engines on the road, the FR32 was no different from standard except it pulled like a train and revved for ever but power peaked at about 5800. The RL31 cam engine felt sluggish below 3000 then pulled very very well, I had an issue and it and I'll rebuild it later this year.

You can put a 130bhp together in a weekend then rolling road it, 150bhp really needs compression so head skim, more than 150 and you need rods and Pistons.

My biggest regret, I should have gone for forged Pistons not V6

Do I need an injection head then or is standard ok for this power ? Sorry for all the questions lol .

Link to comment
Share on other sites

 there are other good road cams that don't need big revs the FR30 high lift high torque the FR31 injection cam. 

 

I have an FR30 and the last time the car was on the road it had a 38DGAS. It ran well - not massive power, but a lot of torque from low revs.

Link to comment
Share on other sites

As I recall 32/36 good for 135bhp

38 DGAS 150+

Twin 40's 150

Twin 45's 180

Twin 48's higher but don't work as well for low revs

It all gets a bit academic as twin webers have a choke limit 7mm less than the bore so 40's run 33 max choke, 45's 38mm Max

Bike carbs most have variable venturi and can be more flexible at low revs, I just match the carb outlet port to the head give or take a few mm

36mm chokes are available for 40s.
Link to comment
Share on other sites

The profile of the choke is like a circular inverted aircraft wing, a venturi, you can indeed run 36mm choke in 40's but have a reduced Venturi effect, it is therefore better to run 36mm choke in 45's where there is room for the full venturi profile.

 

Earlier reply asked about standard or injection head.

The injection head is prefered due to a slightly raised inlet port angle however the main advantage and also why the injection Pinto makes 10 or so Bhp more than the standard is the inlet port short side turn which on the injection head is a smooth curve but on the standard has a sharp edge.

 

163E81F7-5AD0-4194-944A-206F12B6789F.jpg

This diagram is a representation and not acurate.

This why you will often find me with my fingers down the inlet ports of Pinto heads at auto jumbles

  • Like 2
Link to comment
Share on other sites

imho, dont waste your money on 40s, they are too small for a 2ltr Pinto. The max choke size is smaller than an inlet on the head. Save a wee bit longer and go for 45s. They'll support circa 190hp should you wish to increase performance in the future.

I'd fit a 38 or bike carbs before 40s, but bike carb set up can be expensive if bought new. 

I ran a bike carb/megajolt set up on the Green RS in the pic for a while - all 2nd hand, and was well worth the coin. Ran like a sweetie, had circa 160hp and sounded the dogs balls on the cam. 

Previous car had 45s, RL31 cam and monster valves etc. 187hp, pulled like a train to 8000rpm and had a bark louder than a scrap yard rottweiller!!!!!

Get yourself to a local Stock Car builder, they'll show you what kind of power can be produced on a stock carb!!!!! (with supporting mods obviously!)

  • Like 1
Link to comment
Share on other sites

  • 2 weeks later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...