V4

[sbdtasos]

Nice design sbdtasos .
I do not understand how will you assembly con rods to the crank shaft.

conrods will be like that .install all together and then make the crank installation to the motor
in my crank you can add or reduce midle sections ,so with same type you can make a 2 cylinder engine or 6 cylinder engine just add some midle sections

 

[sbdtasos]

Looks like it will be a built-up crankshaft.

Sbdtasos,
Beautiful work. What Cad/Cam software are you using?
Terry

thanks Terry
i am using solidworks and for post prossesing hsmworks

 

[sbdtasos]

we have good progress i hope engine will run before end of this month

 

[neil_1821]

Flipping heck, that’s very nice!

I assume you’ve used CNC for the block and heads? Do you write the code yourself or do you generate it from a 3D model?

 

[sbdtasos]

Flipping heck, that’s very nice!

I assume you’ve used CNC for the block and heads? Do you write the code yourself or do you generate it from a 3D model?

yes all this parts are made from cnc .is not easy to write the code ,i generate the code direcy from the model

 

[neil_1821]

yes all this parts are made from cnc .is not easy to write the code ,i generate the code direcy from the model

Oh yes I understand, coding is not easy but it feels very satisfying when it’s done!

I look forward to seeing it run. Keep up the good work.

 

[sbdtasos]

ignition timing problems
engine start but is not possible to work with 1 distributor
installation of 2 distributor and 2 sensors was the only way

 

[neil_1821]

Those caps look very nice!

Do you know why it wouldn’t work with 1 cap and sensor?

 

[Ghosty]

ignition timing problems
engine start but is not possible to work with 1 distributor
installation of 2 distributor and 2 sensors was the only wayView attachment 103436 View attachment 103436 View attachment 103437 View attachment 103438 View attachment 103439

Because you have 90deg rotation on one crank pin plane for pistons at TDC, cam timing for the cylinders are only at 45deg on the dissy, 2-1 reduction. You would need the take of for the HT leads at 45deg apart for each crank plane not 90deg.
Bedford had this same setup on there V4 powered vans in the 60's, 70's
Cheers
Andrew

 

[sbdtasos]

can some one help me with a problem that i have with timing my ignition
as you will se in previus photo i have pulley with 12 teeth on my crank and 24 teeth on my camshaft so i have a reduction 2-1
as you see the middle top pulley is for the distributor is also 24 teeth but i have different reduction there 4-1 and i dont know why
i undertant that because i have 90deg rotation on one crank pin so that mean 45deg on distributor but i have at 22,5deg
that strange
if need to have spark in my distributor at 45deg i must put also a pulley with 12 teeth then i will have a 1-1 but this rotating the half like 2-1

 

[sition]

Could you tell me the engine ignition Angle is 90 ° a cylinder work?
I have a V4 is 90 ° work time, his trigger on the camshaft, I set up 45 ° triggered a magnet
thank you

 

[sbdtasos]

Could you tell me the engine ignition Angle is 90 ° a cylinder work?
I have a V4 is 90 ° work time, his trigger on the camshaft, I set up 45 ° triggered a magnet
thank you

hello sition
yes ignition angle is 90 deg
but untill now i havent find the problem

 

[stevehuckss396]

Your crankshaft should rotate twice around for every rotation of the camshafts. 2:1
Your cams and distributor should turn together 1:1

If that is what you have it should be fine

 

[sbdtasos]

Your crankshaft should rotate twice around for every rotation of the camshafts. 2:1
Your cams and distributor should turn together 1:1

If that is what you have it should be fine

i am realy confused
my camshafts with the distriutor turn together 1:1
my crank with my camshaft is 2:1
i have 1 sensor on flywheel with 4 magnets
engine angle 90 deg
when i have ignition on 1 cylinder the 4rth cylinder is 90 deg back
firing order 1-4-3-2
so my distibutor must turn 45 deg but this is turning 22,5 deg
1-3 are right side and have 180 deg difference and 2-4 left side also 180 deg diference between them
1-2 are 90 deg diference
the only solution that i found is crank with distributor 1:1 and work
i dont know why i know that is not corect but is working

 

[stevehuckss396]

There are 720 degrees in the cycle
Lets just say #1 & #3 are on the right, #2 and #4 are on the left
Clockwise rotation looking from the front

1 should fire at zero degrees
4 should fire at 270 degrees
3 should fire at 360 degrees
2 should fire at 630 degrees

With 4 magnets on the crankshaft your ignition fires at

zero
90
180
270
360
450
540
630


The distributor should line up on

#1 @ Zero degrees
#4 @ 135 degrees (270 crankshaft)
#3 @ 180 degrees (360 crankshaft)
#2 @ 315 degrees (630 crankshaft)

You can see why it works but the ignition fires twice as much as it needs to.

 

[sbdtasos]

it is alive

 

[necchiom]

Wow! Awesome.

 

[natalefr]

Good job !

 

[ShopShoe]

Lots to see and hear there. Congratulations on a successful build.

--ShopShoe

 

[sbdtasos]

my ignition