Hi I'm from Macedonia and jackets to make 1600 engine, I doubt the valves and channels on their heads.
I do not know if it will fit in a 86mm cylinder valves 42x37 and if fit would be wrong if the IN channel to expand to a 37mm EXchannel to expand to 39mm.:?::?::?:
By default these channels is 30 IN and 32 EX if the IN logical channel to expand and Edge 7mm channel to expand to 7mm, whether this came straight.:?::?::?:
And if you do not collects 42x37 will go a variant of 40dzh36 by broadening the channels IN 34mm and EX 36mm

Please help me and advise me if I'm wrong.:?::?::?:

Welcome Dejan!
Good try with the English translation.
Not sure if I can answer your question,
but I will see if I can decypher your question first.

You are asking if you can fit 42 inlet and 37 exhaust valves in an 86mm bore?

I would say yes, but the valves will be very shrouded, which will restrict the flow.

You would be better with a smaller combination of probably 40 inlet and 35.5.
86mm is 0.5mm bigger than the standard bor of 85.5mm

Thank dangerous
I think whether the ports 37 input and 39 output is enough for valves 42x37 because as 30 input and 32 output is stock head with 35.5 x 32 stock valves.

go after the logic that if vledzniot expand port for 7mm and output to expand to 7mm

Sorry for my English

Ah!
The size of the port should slowly increase from the seat throat,
up to your carby butterfly,
with slight increases in area wherever there is a turn.
Normally the seat throat is 88 to 90% of the valve.
so the port size at the flange shoud be somewhere between the two,
with perhaps some larger size if the manifold changes direction at that point.
A flow bench with a velocity probe can identify where the parts are, that need to be relieved.

Port size is a lot more complicated than increasing the exhaust port the same as the inlet.
There are whole books about the topic, so very difficult to give generalized answers.

The exhaust gases and speed is at a much higher pressure,
so does not need to be increased in size so much.
In fact, with up to a 35 exhaust valve I would not enlarge the port at the exhaust flange at all.
...but this is just my opinion.

Great info thanks DB

Very good info by dangerous as always, I would go as far as to say that the port diameter in relation to the valve sizes also depends on the rest of the combination and torque requirement taking into account the cam and valve train used and combustion efficiency.
You will be hard pressed fitting 42x37 valves into 86mm register and you will only be shrouding the valves if you do so.
Dejan, I'm Macedonian also so you can PM me if you want to discuss in depth.

The question is, what are you using the car for and how much hp/$ you want to achieve?

ben

I want my VW 1303 to do street racing and drag racing. Sakm to achieve and to prove that my 1303 can not resist the new motels vehicle (no understatement to them)
I think of investing but the engine around 600-800 USD.
With that one hundred will combine and invest a little more effort to achieve the range of 400m 11s this is really hard.
A bigger problem is the procurement of parts for delivery in Macedonia.
Here's how pocnav heads and think that by measuring 42 W 37 shall fit in a 86mm cylinder.
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This is the beginning of processing the input port

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And this is the output port that the process of dijamertar 39mm which lifted up, because we always exhaust gases are lighter and go up

@dangerous
nicely said exhaust gases are higher pressure and should not be a port to leave, but I think idzduvnite gases in this case partly hinder the engine and do not come easily to the desired speed(RPM)
I do not know if I'm wrong in this case

Today we did an analysis of the head of AB engine 1300th
He is with 77mm pistons and valves have built in 1600 as it means there 36x32.
valve in this engine is really close to the cylinder.
I think this
1300cc 4cilinder = 325cc
325cc 36 (mm inlet valve) = 9.0277
Now 1600cc 4 = 400cc
400cc 9.0277 = 44.38mm inlet valve
As for 1300 is 36 valve so for 1600 is 44.38 valve
If we increase the parallel proportional valves and the volume of engine.
I think I'm wrong in this case

Hi Dejan,
when making comparisons for flow purposes,
you should calculate AREA of the holes, not diameter.
pi x r x r is the equation.

so for a 36mm valve, 3.1416 x 18 x 18 gives you the area of the 36 valve. (1017.88 square mm)
so cross section per cylinder volume for your first example(325cc) would be 3.132 square mm per CC.

To keep this same cross section with 400cc would equal 1252.77 square mm valve.
Reversing the area formula gets a valve of 40mm.

I understand you perfectly warm dangerous in my calculations should have the right to calculate surfaces.
That's why I asked for my mistakes floors everywhere.
These two heads or are to blow it or else put together a sufficient engine with at least 90mm cylinders.
And yet I missing the output port I made 42x37because it is 39mm wide Is it too or not

Dejan, there is no information on the rest of the combination of your engine:
Crank, balanced, 8 doweled?
Cam
Lifters
Rockers
Carbs
Exhaust

Also, sorry to be blunt but you are wrong in a couple of instances.
1. using 42 x 37 valves in 86mm, 40 x 32 would be my choice
2. enlarging the exhaust port and enlarging the Ex/In ratio without welding the head above the intake port manifold in order to enlarge the intake port proportionally to the exhaust port.

Stock vw exhaust port flows plenty for your application, only a few tricks need to be applied for it to be optimized.

Some good info here:http:
//www.cal-look.com/tech_head_porting.shtml

happy reading

Here's how I have imagined my engine
Crank stock, balanced 9500rpm, 8 doweled
cylinder 86mm
Pistons - of mitsubishi evo 10
Cam - TCS20
Lifters - Stock?(I do not know if you can)
Rockers - Stock
Carbs - Webet 40dcot
Exhaust - Hand made (1-1/4) 36mm
Turbo - T28/4 or T3/4 1bar(~14psi) Custom
Head - 40x36 ,40x34 or 40x32
Ports - intake - 35,2mm and exhaust - ??????

Interesting set up, I don't know why you are so bothered and scientific about port sizes, you are forcing the charge.
Anyway, the TCS20 is set up as a split duration cam, W120 intake, W110 exhaust and can be run with even stock heads.
Make sure you use dual valve springs and new lifters.

To go with the double valve springs only STD spring will start to equal all 8 wide spring and will start for 5-6mm to
supercharged and narrow springs will take from (Fiat Ritmo 130tc) while further or if you manage to find a wide springs from Mercedes 124 300d they hard enough for tcs20.

The lifters do not know if I can stay with STDs or will I recommend any of 30mm.

are you saying that you will combine stock springs and narrow springs from Ritmo? stock new lifters will work.
I usually buy the cam and lifter package when ordering, ensures compatibility.

Do you combine.
For me there because of the possibility of combining inexpensive parts for some cars.
with respect in the Beetle and used parts are cheap, why do experiments in their heads.
These two heads have missed but I'll take my order T2 engine bearing on CT has built an oil filter that I like.
When it comes to stock federite the valve springs for engine valves of 1.6 Beetle of us here use them in another car that drives national shalpionat.
Seemingly federite are the same height, width, number of lineages thickness of the wire but the material they are made ​​fedevite the 1.6 engine

I found something on the French who understand, understand that you do not understand try to understand
Welcome
http://www.flat4ever.com/projet-1776c
Here there are about head