52 replies to this topic

[Retroman]

I don’t know the CR. I asked for 9.5:1.

I’d hope the cam was timed properly but I am beginning to think that it’s not been done well.

I can’t get any info out of Paul Inch either.

It wasn’t a cheapo build either.

Slarks are pretty good at what they do and if Neil thinks it’s the exhaust I’ll go with that for now. Considering the magic pipe plus single box RC40 in order to keep the look correct ish.

If that fails it will be a full on twin 1.25” SUs with freeflow manifold and the RC40.

To be honest, even though it’s only putting out 43hp the 60ftlb with the 3.4FD is still quite fun to drive.

 

The 9.5:1 should be fine, and as you say the cam timing is a bit unknown, and looking at the torque/hp/revs it maybe out.

 

No disrespect to anyone but I am currently sorting two badly built engines out, one from some tw*t on ebay and another in a mint 1967 S that was an expensive build by someone of repute...2nd hand pistons, head sat on the engine number plate, head mods of a six year old...done with worn guides left in...water leak up the stud behind the thermostat (should be a bolt) blasted and plated head studs of different types...the list goes on.

  As carbon comments above the standard twin inlet manifold is chronic, personally I consider the only place for twin hs2's is on an original Cooper or S. A single standard 1 1/2 is almost as good, and vizarded is better.

 

You have proved a single HS2 with a modified head produces virtually the same as the Twin HS2's

  

To move this on if you are interested, I will offer my services to you as a one off, send me the manifold and HS2 carb,

I will do my magic for 1/2 price and if you are pleased with the outcome pay me what you think. PM me.

You should see better results than the standard twin setup.

It would be really interesting to see what you could get from a vizarded HS2 and manifold work, preferably with the peashooter exhaust, you were aiming for a standard look....

It will need a dyno run to set it up.

[Minigman]

Thanks for the offer. I will certainly consider it for sure come the winter lay up. Like you say, it would be interesting to know how restrictive the whole inlet and carb is in terms of bhp.

Maybe us should pay you £s per bhp gain...Haha!

Will pm you.

[Retroman]

I have said for the last 25 years if you can buy one BHP for £50 you are doing well...so with inflation of time who knows....hahah

 

Also said for years; vets, solicitors and weather forecasters should be paid on results

 

There might be a few less of them but they would be more accurate, eating beans in a tent 24/7 concentrates the mind.

 

How much is a BHP worth...? maybe we should set up a BHP exchange rate, as there will need to be a difference between buying

 

and selling, we could also auction it...I recently sold over 40BHP for 1400 quid (mates rates)

 

Anyone else got a comparison..?

[Minigman]

Maybe Pounds per bhp percentage increase over the published standard spec, and working on a sliding scale.

The first 20% gain would be easy money!

[Retroman]

As always, the important 5% is the most difficult

 

So the plan is to get some flow figures on a standard HS2 manifold

 

Then modify and remeasure

 

I aim to get figures for the 1 1/4 carb too, standard and modified....watch this space

[nicklouse]

I have said for the last 25 years if you can buy one BHP for £50 you are doing well...so with inflation of time who knows....hahah

 

Also said for years; vets, solicitors and weather forecasters should be paid on results

 

There might be a few less of them but they would be more accurate, eating beans in a tent 24/7 concentrates the mind.

 

How much is a BHP worth...? maybe we should set up a BHP exchange rate, as there will need to be a difference between buying

 

and selling, we could also auction it...I recently sold over 40BHP for 1400 quid (mates rates)

 

Anyone else got a comparison..?

nope, but i remember in the late 80-early 90s discussing power increases and the A series was the most expensive per BHP.

 

also i learnt that being able to assemble  a engine is not the same a building an engine.

[Retroman]

Very true you can spend less doing a scooby, evo, cossy, crossflow, red top, zetec.....

 

and yes an engine is not lego, to build one correctly needs knowledge, ATD (attention to detail), tools, time and work (physical. mental and engineering) and maybe even a calculator...!!

 

Iike 2nite working out what cc for the head on petrol pete's screamer 998 took 1/2 an hour

[Minigman]

As always, the important 5% is the most difficult

So the plan is to get some flow figures on a standard HS2 manifold

Then modify and remeasure

I aim to get figures for the 1 1/4 carb too, standard and modified....watch this space

You can see why it’s easier to just go with larger single carb, freeflow manifold and larger exhaust. All tried and tested. But where’s the fun in that?

I like the idea of a std looking car that can go a bit.

Looking forward to your findings Retroman