The 4" Bore Thread

[58vw]

awesome mexx...keep it up

[Shag55]

Very nice Mexx!!

[ugly duckling]

HELLO MEX,SOME 26YRS AGO WHEN I STARTDED PORTING HEADS AT GENE BERG ENT, BTW A VERY WELL KNOWN AND VERY SUCSESSFULL VW INAVATOR WITH MANY NHRA WINS ON N/A ENGINES (NOT HAIR DRYER ENGINES)ANYWHO, THERE WERE A VERY NUMBER OF SETS THAT ME AN MY MENTOR DID THAT WERE FULLY POLISHED, CHAMBERS,EXHAST,AND INTAKE, AND THE CARS THEY WENT ON DID NOT EFECT THEM AS FAR AS PURE PERFORMANCE IN A NATERAIL ASPERATED WORLD. MANY MANY SETS OF 12SEC AND 11SEC HEADS WERE DONE THIS WAY,HUMM THOSE ARE VERY RESPECTIBLE ##S, DO I FULLY POLISH TODAY, NO AND WHY IS ITS VERY UNHEALTHY TO BRING THE PORT TO THIS STATE,ITS BAD ENGHOF TO BRING IT TO A 40 GRIT FINISH, WHAT IM SAYING IS IT WORKS BOTH WAYS. THERE ARE ALOT OF LAZY HEAD PORTERS OUT THERE, AND IF THEY GIVE YOU THE LINE THAT UGLY IN A PORT IS BETTER THERE JUST FLAT OUT FULL OF IT. IF YOUR GOING TO SPEND A MILLON DOLLARS ON A SET OF HEADS WHAT WOULD YOU RATHER HAVE, SOME THING THAT THE FLINTSTONES DID OR SOMETHING THAT A TRUE ARTISTS DID. OR YOU COULD JUST (CHEAT) AND HANG THE BIGGEST HAIR DRYER OFF THE ASS END OF IT AND PRAY THAT IT STAYS TOGETHER. NICE GOODS YA GOT THERE MEX. UD OUT.

[NoBars]

Those cylinders are badass. Are there iron sleeves pressed in or are they going to be nikasil coated?

[MeXX]

Hi

These are for race use only and are nodular iron sleeved.

MeXX

[Dead Dog]

looks fantastic!

[Frallan]

In 1986 I was building my own 4,060" bore engine based on TIV block.
I boughta  set of angle flow heads "3 litre heads" , bare casting.
I cut them up and started building my own split port heads.

Scat released a new set of heads that suited me and the cut up heads sat for a while on my shelf.
Then I gave them away to a friend.
He is pretty skilled in most everything.

Welding practice took place on my old heads.
This was all done long time a go but I just had to share the pictures when I came across these old friends last week.

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[dangerous]

I have build one wbx engine with 101's for racing only , it has 280 hp with 51 carbs , he has run 10,9 in a street car this year . But i would never build this engine size with less hp for german street driving - autobahn -

Udo

very nice Udo

First WBX with an oilsump :-) I like it but a lot of work

Udo

Found these old pictures from 1995-6 I think.

[andy198712]

some pulley wheel what blower did it spin?

[dangerous]

some pulley wheel what blower did it spin?

Back then it was a Godfrey-Marshall K200,



but eventually put these on:

[spoolin70]

Good morning all.

With a larger bore/larger cylinder volume is there any special considerations in terms of
ignition source ?

I'm still at the "collecting parts" stage and was thinking about coil per plug V wasted spark.

I use wasted spark at the moment on my small motor but was considering coil per plug for my bigger engine (with boost)

Any thoughts or experience gratefully received.

Have a good day now
Darren

[MeXX]

Good morning all.

With a larger bore/larger cylinder volume is there any special considerations in terms of
ignition source ?

Darren

Dear Darren

COP (Coil on plug) is my choice too. I'm using it on the street engine and on the racing mill.
First I was running Ford EDIS wasted spark with ignition wires 238HP with up to 200HP NOS,
and never had and Ignition issue.
Now I'm running AEM pencil type COP to get rid of the plug wires over 300HP and up too 200HP NOS
and never had and Ignition issue.

So keep on 4 inchin'

MeXX

[spoolin70]

Hi Mexx
Thanks for the input and the examples of your results.
Good to know the AEM performed well, I've been looking at their products as an alternative to MSD.

Any reason you went for coil 'on' plug instead of coil 'per' plug ?
I was thinking of using something like this :
http://www.aemelectronics.com/high-output-inductive-dumb-coil-1239

Thanks again
Darren

[Shag55]

I'm setting m e up with he smart coils. Very nice! Though mine is not big bore.

[spoolin70]

Hi
When you say 'smart' coils, I'm guessing that's the type that need a driver/controller ?
I'm hoping I can use 'dumb' coils as I'm pretty sure my ecu can drive
up to 6 coils directly.

Thanks for the reply, good to know people have their ignition
this way as I can't recall seeing 4x coils or coils on plugs that often.
(although didn't the wheeler dealer bus use coil per plug ? Can't
recall the controller/driver though, possibly MSD ?)

Thanks
Darren

[Shag55]

Smart coils have built in ignighter while dumb coils need a ignighter box.
Allen Fores car has a Motec ignition box and bumb coils. It makes 1150hp!

[spoolin70]

Good morning 4 inchers

Any recommendations for turbo friendly pistons ?
Looks like I might need some with a BIIIIG dish.

I'm in the UK so a local brand would be handy but not essential.
Anyone used Accralite or Omega pistons ?

Thanks
Darren

[Airspeed]

I'd say, for turbo (and nitrous) you don't want a certain piston brand, but more a piston specification.

[Udo]

Good morning 4 inchers

Any recommendations for turbo friendly pistons ?
Looks like I might need some with a BIIIIG dish.

I'm in the UK so a local brand would be handy but not essential.
Anyone used Accralite or Omega pistons ?

Thanks
Darren

i have used JE dished pistons 4" and autocraft cylindersin a turbo engine with good results .  But who needs a turbo :-)

There are Accralite 103 pistons avaliable for Type4 engines , good quality for N/A engines

Udo

[Fiatdude]

JE pistons in mine -- They will modify them any way you want too (for a small additional fee LOL) like moving the wrist pin location up or down and put whatever top you want on them -- These are turbo friendly with the top dish milled -- the top ring gland moved down -- the the wrist pin location moved up (into the oil ring) for using a longer rod



These are 4"+.030 -- I have a almost new set of 4" exactly like these for sale if you'd be interested -- set up for chevy rods

[spoolin70]

Thanks for the replies

So important factors are :

Crown thickness (especially with turbo, I need one udo  )
Ringland area and ringpack size
Compression hight
Dish size (circular or chamber mirror)

Ceramic coated crown and Teflon coated skirts look nice but not essential

Anything else I'm missing ?

Fiatdude - thanks for the offer. I've got to mock up my engine first and take some much needed measurements.
Boxes of parts are no good for measuring deck hight, clearances etc.
I'm pretty certain I've got to lower my compression quite a bit and as chamber mods are a no no,
so I'm looking at other areas first.

What CC dish are your pistons ? I have 12cc now but would like 20+

Thanks
Darren

[turbovan]

Thanks for the replies

So important factors are :

Crown thickness (especially with turbo, I need one udo  )
Ringland area and ringpack size
Compression hight
Dish size (circular or chamber mirror)

Ceramic coated crown and Teflon coated skirts look nice but not essential

Anything else I'm missing ?

Fiatdude - thanks for the offer. I've got to mock up my engine first and take some much needed measurements.
Boxes of parts are no good for measuring deck hight, clearances etc.
I'm pretty certain I've got to lower my compression quite a bit and as chamber mods are a no no,
so I'm looking at other areas first.

What CC dish are your pistons ? I have 12cc now but would like 20+

Thanks
Darren


Darren.. i used the Jeff Denham JE ones with pauter barrels with good results , no dish in them…
571 hp @ 18psi and under 6000rpm.. I'm sure Matt Keene will give you the info you require.

chris

[spoolin70]

Thanks for the info Chris.

I'm pretty sure I'll be needing a deep dish as chamber volume is only 45cc.
Johannes has advised not to touch the chamber so I'll be leaving well alone.

I did hear about your engine numbers through the grapevine - VERY impressive !
You must be really pleased.

Thanks
Darren

[turbovan]

Thanks for the info Chris.

I'm pretty sure I'll be needing a deep dish as chamber volume is only 45cc.
Johannes has advised not to touch the chamber so I'll be leaving well alone.

I did hear about your engine numbers through the grapevine - VERY impressive !
You must be really pleased.

Thanks
Darren




cheers… my JPM heads were 65cc, and still needed a further 20cc
to get a 7.8.1 … looks like your be looking for a lot !!

[Fiatdude]

remember with a 4" bore a dish goes a long way -- but with 45cc heads you might have to drop the piston back down into the cylinder -- If you have ceramic guy I would do a coating especially with a turbo

When your painting the image of you engine, you need to make some decisions and start working outward from there -- I would recommend finding a combination that works and then copying it rather than picking one from column A, one from column B style ----- There are many ways to put together an engine and sometimes the parts just don't work well together -- so if you know someone who has gone down this road before and you like the results of their build, I'd copy it

[spoolin70]

When your painting the image of you engine, you need to make some decisions and start working outward from there -- I would recommend finding a combination that works and then copying it rather than picking one from column A, one from column B style ----- There are many ways to put together an engine and sometimes the parts just don't work well together -- so if you know someone who has gone down this road before and you like the results of their build, I'd copy it

[/quote]

That's some sound advice there - thanks

Selecting parts that work together is a skillful art that I've come to appreciate from any engine builder !

The majority of my engine came complete (thanks Richie) but was missing heads. Getting the heads I have now to work with the
rest of the parts is now my biggest itch. I certainly wasn't banking on needing such a big compression loss.
Sadly there's not an abundance of 4" turbo engines out there for reference and lowering compression also seems to be
a builders preference rather than a set method.

Thanks
Darren

[UltraOrange67-2443]

Hi to all the 4inchers

Here's another version of my 4 inch race engines

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New billet Cylinders

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Billet Cylinders for Autolinea case

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Modified Autolinea case

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Modified Autolinea case

MeXX

How much are the Billet Cylinders Mexx?

[spoolin70]

+1 I'd like to know too - for 6 stud Autolinea case

Thanks
Darren

[MeXX]

How much are the Billet Cylinders Mexx?

Hi...

There is a 6 stud version
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and a 7 stud version available...
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Billet cylinder housing is 980 € each...

for intrest U can PM me...

MeXX

[MeXX]

New Heads available...

<a href="http://www.youtube.com/v/u6qxE8coG54" target="_blank">http://www.youtube.com/v/u6qxE8coG54</a>

MeXX