YB Big stroke big bore

[panosdp]

I have developed for one of my customers a 2280cc Ford YB engine Normaly aspirated
Crank, pistons and rods were made in our factory premisses (www.dpengineparts.com). It is a 84mm stroke with 136mm c/c rod and 93mm piston diameter
The engine is placed in a MK2 Escort sashi and my customer will be looking in Drag racing with it in 3 weeks in street category (Greek Dragster Championship)
The car was using before a Kent Cam profile (Final Mechanical stage - something like 11.7mm-313 degrees) and was producing 230whp which it is around 260BHP which was not enough for us
As a new upgrade for the race we did for him a higher lift/higher duration profile and we also port more the cylinder head (Sevdalis Superflow center made that for him - Greek engine developer)
The car is using the Race throttle bodie kit from Jenvey that we again have port it for bigger volume.
We are hopping this time to be able after all those mods to reach 245+whp which is a 280BHP engine
Of course we are using all the goodies we need for such an engine
I will show dyno graph and photo of the pistons and rods we have made for him while using the older cam profile producing 260BHP
The target is this 280BHP engine to make 1/4 in 12 sec having in mind that the sashi is not weight reduced (street car)

Here I would like to know everyones experience in similar sashi/engine combination

If the car does not show the results we are after to build a super stroke engine with something like 94-100mm stroke and 96 or even 97mm piston diameter
We know that the Genuine Ford Cylinder head is restrictive but I think we can get this engine above 300HP with the above engine capacilty 2.7-2.9lt.
On the block side we are thinking to use a top adaptor plate and sleeve it so we can get extra 20mm in length for both stroke and rod length.
of course crank will use smaller diameter rod bearings.
Maybe we would better make a billet aluminum block but we do not want to have huge costs involving in the project.

So again I would like any recommendations here.


We had a quick discussion on cylinder head swap with Millington but he was not very happy to supply us only the head so we never worked someting out.

Any suggestions?

Anyone that could help this project

Thanks very much

[flowmetrics]

the conrods of the 2280cc engine

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various views of the slipper piston

[escortinadriver]

Sounds Like an interesting project! Have often thought about a big bore pinto with sleaves. What size is possible? How are you going to fit a stroke that much bigger??????
Shaun

[panosdp]

96mm bore is certenly possible
Also I am now working on the stroke but I am pretty sure we can do the 94mm or 96mm
Maybe even more
That all in OE block of course
We are also looking in making a two piece billet aluminum block
We have not decided yet but we want to target above 330Hp on Cossie head without having to pay a special made cylinder head.
Of course with the Billet block we might be able to increase both bore and stroke and make a 3lt Cossie engine
We are looking at that now
I will be keeping the forum posted with the upgrades we do

I also want to let you know that this thread runs also on the technical section (just before Engine building section)
So you can also follow it there
In any plase I will be getting replies ASAP

Thanks for getting in to discussion
Waiting for thoughts and suggestions

[BIG-G]

Great stuff this and keep us posted

[Luke]

Do you think a cossie head can me made to flow for 330hp N/A?

[RWD fords rule]

Millington engines are an excellent bench mark, series one 2.5 engines use heavily modified cosworth head castings, around 300bhp, the series two are all alloy custom head and block making 330 odd bhp from 2.5, the alloy blocks are much taller allowing more stroke and still getting a decent rod ratio

Using a std length block, long stroke and trying to make good hp numbers is difficult imho, also head flow and cam profiles will play a big role, breathing enough air for the larger bottom end

Ideally if you had a block around 25mm taller then you could use 90mm stroke or more with long rods and short slipper pistons, this will improve high rpm power and peak torque

If you could get your hands on a second hand millington series one head that would be an excellent start, I have seen a few come up for sale at fairly big money but on a build like this it may be cheaper vs getting everything custom made

I like the two piece block idea, that could work well, a 96mm bore would be easily achievable then and very long stroke, the burton alloy blocks can be got with a 96mm bore and longer, about 10mm longer than a std block off the top of my head, about 4k though

I would advise using one of my tensioner locking plates even if I do say so myself lol, no sense in one single tensioner nut holding an expensive engine like that together!

http://www.ebay.co.uk/itm/3209158509...#ht_954wt_1396

[RWD fords rule]

Very nice rods and pistons btw, look very light + strong

[jems]

My advise for this engine project would be to run a Smith & Jones alloy block. We have run these blocks to 2.5 litre making 348bhp and 252 ft and had no problems at all. This power was made on an old casting head, soon Smith & Jones will have a new big port head for the yb,this will take the yb to a new level!
These new blocks are the best thing that has happened to the yb for many years, they are so so much stronger than a 200 block. For example, a tuning company in Denmark have run a 2 litre turbo on e 85 fuel to...wait for it ...........1100bhp!!!!

Back in the day Mountune made 300 bhp from a 2litre yb with the help from Eddie Griffiths who designed the head spec, cams and exhaust. We have nearly broke the 300 bhp with a 2 litre @ 296bhp, so close.

Rember big is not always better as a std 200 block will bore flex if its bored over 92mm! We have tested this and an average bore defflection .002 to .004 worse case.
if you would like to discuss further an opened minded well researched yb spec please ring:

jon@jems race engineering 01327 702270
0r e mail jems@jemsracing.co.uk
www.jemsracing.co.uk

[DarthVader]

With going to such a bigger bore, won't there be no / little material left between the bores for head gasket to seal on ?

[madflow]

I m not pinto familiar , but have a friend who runs a 2.9 liter Esslinger , but this is based on the american pinto which can accomodate the bigger bores as its a longer block , these have been taken up to 3 liters with alloy blocks but he recons its not possible on a standard type or standard measurement uk pinto block to get the very large over bore .Is it possble to have liners furnace brazed in like an old BDG was done? Some hotrodders of these usa pintos have also tried the volvo head route to get more airflow but it seems the custom esslinger alloy head can do it better --hate to think of the price though it must be a matching price tag on the billit alloy pinto blocks available. At some point though you will have to rename this engine as very little of it will be PINTO, out of interests sake what is the average life span of these .

[Arieke]

out of interests sake what is the average life span of these .

would like to know that to

[flowmetrics]

Are Millington engines using the Smith & Jones alloy block (g&w cast)?

[RWD fords rule]

As far as I know the series 2 Millington engines have stepped away from the YB design, a series 2 head will not bolt onto a pinto/YB block which I think was a bad decision,
S & J are sticking to YB, I expect they will sell a lot of their new large port heads when available and the alloy blocks for full on builds

The esslinger engines have got to be cheaper, have to add in import duty though, but they are 8v and would never make the same hp and torque as a S & J engine, if there was a 2.5 or 3.0 8v class then that would be a different story

They are totally custom engines really, custom cast head and block, and few if any original parts, like most race engines only a few steps further

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The dynograph of the 2280cc engine
217.7HP at wheels@ 6910rpm

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We will test a 'new' cylinder head and cam profiles with the old 2280cc engine block .
Some photos

[Turboman]

Any further progress

[timmintgreenmex]

Hi I have a normally associated Yb in my mk2 that I built a few years ago.I want to change the cams for mechanical.can you tell me what Kent can profile you used in the 260 bhp engine your developing. Many thanks Tim