Off the shelve engine building

[Eddie DVK]

^^^^ Whoooo 

10 's  Again..  congrats

Seen the list of your engineparts, the only ''strange part'' for me is you are useing very short rods, not very common in type 1 engines  .

[fish]

Wow, thats a great time not only for a streeter and as Peter said, KISS principal works wonders.

I am assuming the side load created by the short rods is not all that apparent when using light pistons with low compression height but aiding in a snappy engine and low RPM torque with the MS250 and JPM cam providing the HP in the upper RPM, a bit of old school thinking with new school tech.

I also love the idea of a stepped header, we have just finished the mock up of a stepped header for Type 4 based on an old F1 design purely started by the lack of room between the pushrod tubes.

[dangerous]

^^^^ Whoooo 

10 's  Again..  congrats

Seen the list of your engineparts, the only ''strange part'' for me is you are useing very short rods, not very common in type 1 engines  .

That is not 'short'....especially with only 82 stroke.

[Jon]

10.88 today! way to go Johnny!

[modnrod]

Seen the list of your engineparts, the only ''strange part'' for me is you are useing very short rods, not very common in type 1 engines  .

That is not 'short'....especially with only 82 stroke.

Same as a Chev 383 stroker, but yes, it's still a short ratio for ACVW.
Was any rod/piston clearancing needed? Isn't that where the limitation is on an ACVW for short rods? I've had to increase my planned rod length in my combo to avoid clearancing here, but I'm using a very small bore.

Parts make an engine, assembly care makes power, but WOW! 10s is TOUGH! 
REALLY tough. 

[dangerous]

Porsche length is 136mm which is only 1mm shorter than VW.
I have used that length successfully up to 86 with clearing,
but at 82mm should be a 'bolt-in'.

The side piston load increase is so small it is not an issue.
(do a tan-1 on the numbers to see wow little the angle changes!)

'383' has a 3.75 stroke with 5.7'' or even the original 400 Chevy rods at 5.565",
and that is a WHOLE lot more radical.

My first ever billet crank was 90mm with a 5.5" Carrillo.
It needed a lot of piston clearing at BDC, and performed very well, even at high rpm!
It had no indication of excessive bore wear,
but once I opened up the theory books, I changed to a 5.6, and then eventually to a 5.7".
The 5.7" was a nice fit at BDC.

I don't get much into rod ratio, except for the calculation of acceleration
to determine what level of strength I need in the rod and rod bolts.

It is a lot more easy for us VW folk to choose based on what fits the easiest,
and that just happens to fit within accepted industry standards of acceptable RR limits.

[richie]

He managed 10.88@199.34 KMH best yesterday and ran a bunch of 10s on a seriously hot day, and is a happy man for sure With some better air next weekend at SCC he should see some more improvement

cheers Richie

[JS]

So wow, first race weekend with a "new" car and a 10 on the 4th run. Unexpected to say the least!!
The limit now seems to be suspension, I will send the Spax´s to England after SCC to have them re-valved, as the 60 foot went down when I tried anything but the hardest setting.
We will also play a little with Richie´s scales at SCC and see if we can fine tune the suspension a little.

John - The springs were installed at 185-195. Max was "out of range".  

mymedusa - If you start with nothing and have JPM build it (I did not), estimate around $20k.

Pete - THANKS!  

I would have built it with longer rods, but saved on using the Porsche journal Carillo´s I had in the engine before.
There is more to be had, the header used was not in firing order, the firing order one produces 5hp more from 3-8000rpm.
Unfortunately it hit the traction bar, so I will modify the car for it this winter. Also the Ti valves and lighter springs will produce more hp.

Thanks Richie, Stian, Hermann, DBR, Finnish delegation, Rune and everybody for a great weekend!

[Eddie DVK]

Porsche length is 136mm which is only 1mm shorter than VW.
I have used that length successfully up to 86 with clearing,
but at 82mm should be a 'bolt-in'.

The side piston load increase is so small it is not an issue.
(do a tan-1 on the numbers to see wow little the angle changes!)

'383' has a 3.75 stroke with 5.7'' or even the original 400 Chevy rods at 5.565",
and that is a WHOLE lot more radical.

My first ever billet crank was 90mm with a 5.5" Carrillo.
It needed a lot of piston clearing at BDC, and performed very well, even at high rpm!
It had no indication of excessive bore wear,
but once I opened up the theory books, I changed to a 5.6, and then eventually to a 5.7".
The 5.7" was a nice fit at BDC.

I don't get much into rod ratio, except for the calculation of acceleration
to determine what level of strength I need in the rod and rod bolts.

It is a lot more easy for us VW folk to choose based on what fits the easiest,
and that just happens to fit within accepted industry standards of acceptable RR limits.

I know they used Porsche rods to get rid off the clearance problems back in the old days. (also for their weight )
That was what I was thinking nowdays the more common rods in type 1 are the 5.6 and 5.7, so that was why was a bit supriced with 'short' rod.

I would have built it with longer rods, but saved on using the Porsche journal Carillo´s I had in the engine before.

Cool js, you just had them already  .
I thought maybe with a special JPM cam (with lots of duration) you want to make a very torque engine.

Cool combination and Respect for the 10 s ypu have run.
Maybe you can post some pictures.

Regards Edgar

[JS]

I don´t have the cam card here, but from memory it´s 109 lobe separation, 15,1mm lift, 275 degrees @0,05 lift.

[mymedusa]

Gratulation for the numbers! And thank you for sharing!
Sounds all so amazing so should be alot of fun. Keep on going!

Chris

[Rocket Ron]

Congratulations JS

 If you dont mind me asking what sort of weight is your bug

Regards Ron

[JS]

Thanks a lot Ron! About 1690lbs/765kg. The car itself is about 45lbs/20kg lighter than stock.

[Rocket Ron]

Thanks a lot Ron! About 1690lbs/765kg. The car itself is about 45lbs/20kg lighter than stock.

That's makes your runs even more impressive. Can't wait to see your numbers this weekend, I take it you're racing this weekend as well ?

[JS]

I will try. 

[Udo]

Those are nice numbers, congrats - i know what you need to make a 10 with a car like that . But if you get the 60 feet down your gearbox will break - i think

Udo