I need some cam suggestions for my 78x94 IDA motor...

[Udo]

Or you buy some short ones :-) Avaliable at csp , vee dub parts and my shop . I do not know if Bergs have those back in stock ?

Udo

[BeetleBug]

Or you buy some short ones :-) Avaliable at csp , vee dub parts and my shop . I do not know if Bergs have those back in stock ?

Udo

That`s also a solution. Depending on how much rpms he is going to run his total intake length from the intake valve to the top of the velocity stack should be 30.7cm (8000rpms) or 41.8cm. Or 9000 rpms = 37.2cm.

[Shag55]

Ray Velerro just did a set of CBs, they came out nice. You can see them on the UAC on the engine build for Dawn.

[K-Roc]

Also you can change Velocity stack height as well.

[Hotrodvw]

Manifolds I have are the Empi tall IDA units........ugly bastards they are.  The bases are HUGE!   Gonna be tough to fit them in the tin holes w/o mods... 

[Udo]

I think the short ones work well. My wife did a bet et of 11,5 with our black street car and this year consistant 11.0 with her race car . Same engine 94x82 . This engine has welded and ported old VW041 heads and my short manifolds , lots of torque

Udo

[Hotrodvw]

Lots of time slips and experiences here with everything but 78x94 motors.....      Anyone have experiences with this combo specifically??

[Udo]

On this combo i had good experience with Pauter V4 cam ...  Street car ET 12,5 on DOT's .

Udo

[bugnut68]

Lots of time slips and experiences here with everything but 78x94 motors.....      Anyone have experiences with this combo specifically??

I don't know his entire combo, but Ricky Racer from Portland's ancient teal green '55 Oval (the burnout king at PNW VW events, no doubt!) I believe has a 2165 combo and he runs 13's all day long.

[Cheesepanzer]

Simply another man's opinion....

Stock gearing, in particular that tall 1.26 3rd, is going to be tough on a bigger cam.  I know your gearbox is probably all together and you aren't looking to re-do a gearbox, but I might make one suggestion for a change later on down the road.  I totally "get" the need to have the taller gears in a more rural area.  See if you can find a used early gear box for cheap and pull out the 1.31 3rd gear.  Weld the syncro and replace the 1.26 in your current box.  You will really like the overall drivability and your engine will thank you.

I would echo the recommendations of the FK87, providing your heads are pretty big and flow well.  With a 1.26 3rd, shifting out of 2nd at around 7500 rpms will drop the rpms low into the power band.  It will pull, but clearly the 1.31 will gain you about 500-700 rpms, raising the power band up, reducing your elapsed time at the track.

With nice heads you should see power from about 3700 to 7500 rpms.  Its a kick ass cam!  It will make those IDA's bark! 

[TexasTom]

Perhaps Jim Ratto will light in ... I'm pretty sure he's currently running a 78X94 engine, (Denham?) nice heads and the 86C, BUT also runs a close ratio box.
He'd be the man I'D ask as he has much good info on this combination and has used multiple different cams with it.

If you're going to choose one of these larger cams (86C or K87), maybe try dialing in a few extra degrees of advance ...

With the stock box, I still say K10 and no larger. If the heads are any good, it will run the number.

TxT

[Hotrodvw]

Good info, thanks Tom and WardVWRacer.  I will definitely consider swapping the 3rd gear.  I'll PM Ratto and see what he has to say about it. 
I have the CB Perf. digital ignition, so I can play with the timing curve on it as much as I'd like to.   

Eric

[TexasTom]

Concerning 'timing' ... I was talking about CAM timing, just to make sure.
That'll push the 'power band' of chosen cam up a bit and make better power down lower to push those high gears!

TxT

[stealth67vw]

I'm not sure now, but last time I talked to Ratto, he was running a stock geared 4.37 box and Clyde Berg/Ratto ported 44 x 37.5 heads with the 86C advanced 2 degrees and locked ignition timing in his 2165.

[Hotrodvw]

Yup, I missed that 

[Zach Gomulka]

I thought he was running a Pauter cam?

[stealth67vw]

I thought he was running a Pauter cam?

You need to keep up. Jim swaps cams more than he swaps underwear.

[BeetleBug]

Simply another man's opinion....

Stock gearing, in particular that tall 1.26 3rd, is going to be tough on a bigger cam.  I know your gearbox is probably all together and you aren't looking to re-do a gearbox, but I might make one suggestion for a change later on down the road.  I totally "get" the need to have the taller gears in a more rural area.  See if you can find a used early gear box for cheap and pull out the 1.31 3rd gear.  Weld the syncro and replace the 1.26 in your current box.  You will really like the overall drivability and your engine will thank you.

I would echo the recommendations of the FK87, providing your heads are pretty big and flow well.  With a 1.26 3rd, shifting out of 2nd at around 7500 rpms will drop the rpms low into the power band.  It will pull, but clearly the 1.31 will gain you about 500-700 rpms, raising the power band up, reducing your elapsed time at the track.

With nice heads you should see power from about 3700 to 7500 rpms.  Its a kick ass cam!  It will make those IDA's bark! 

When racing there is no point shifting gear to 4th with this gearbox. A 1.26 3rd will easily take the car over the line but you got to make sure you build a engine that likes to rev (7500+) You loose a lot of time changing gears and especially from 3rd to 4th with a original gearbox.

http://www.csp-shop.com/cshop/technik/getriebeberechnung6.php

Transmission Ratio Chart
Differential Ratio: 3.88
4th Gear: 0.89
Tyre: 205 / 70-15

Gear 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000 7500 8000
1.       8     11    15    19     23    26    30    34    38    41    45    49      53   57    60
2.      14     21   28    35     41    48     55    62    69    76    83    90     97   104  111
3.      23     34   45    57     68    79     90   102  113   124  136   147   158  170   181
4.      35    52    69    87    104   122   139  156  174   191   208  226    243   -      -

Values in km/h

You have received quite a lot of good advices in this thread to keep you away from the worst traps. Personally I think that there is nothing more borring than a average stroker with IDA`s, lazy cam, lazy compression, tall manifolds with a HP curve peaking at around 5600 - 5900 rpms. Do things right together with your head guy and you should be able to make your 78 x 94 scream. Your least worries should be how to fit those ugly EMPI manifolds and as a matter of fact a good start to your build would be to sell them.

-BB-

[Jesse/DVK]

What compression would you recommend with such an engine? I'm going to raise it from 9.8:1 to 10.7:1 and I hope that I will notice it or that I should go higher.

[Udo]

I thought he was running a Pauter cam?

Yes , but it was too small. This is what i told him ...

Udo

[Hotrodvw]

So, should I consider some shorter manifolds?   What will clear best in a stock '67 sedan so I can close the deck lid?

[BeetleBug]

So, should I consider some shorter manifolds?   What will clear best in a stock '67 sedan so I can close the deck lid?

Go ahead and measure the total length of your intake channel from the intake valve up to the velocity stack and you will know the answer to your question. My guess is yes, see above for the length you should aim for.

 

[Cheesepanzer]

Simply another man's opinion....

Stock gearing, in particular that tall 1.26 3rd, is going to be tough on a bigger cam.  I know your gearbox is probably all together and you aren't looking to re-do a gearbox, but I might make one suggestion for a change later on down the road.  I totally "get" the need to have the taller gears in a more rural area.  See if you can find a used early gear box for cheap and pull out the 1.31 3rd gear.  Weld the syncro and replace the 1.26 in your current box.  You will really like the overall drivability and your engine will thank you.

I would echo the recommendations of the FK87, providing your heads are pretty big and flow well.  With a 1.26 3rd, shifting out of 2nd at around 7500 rpms will drop the rpms low into the power band.  It will pull, but clearly the 1.31 will gain you about 500-700 rpms, raising the power band up, reducing your elapsed time at the track.

With nice heads you should see power from about 3700 to 7500 rpms.  Its a kick ass cam!  It will make those IDA's bark! 

When racing there is no point shifting gear to 4th with this gearbox. A 1.26 3rd will easily take the car over the line but you got to make sure you build a engine that likes to rev (7500+) You loose a lot of time changing gears and especially from 3rd to 4th with a original gearbox.

BB, my suggestion was geared towards (no pun intended) improving the overall drivability of a "hot street" engine with a stock geared car.  Whether or not you decide to drive through the traps in 3rd is up to you.  A 1.31 mated to a .93 4th will apply the power from a big cammed engine better than a 1.26/.89 combo all day long and it won't fall on its face with that huge gap between the 2.06/1.26 change.  It will make that combo a heck of a lot more fun to drive.  And isn't that what its all about?

Of course there's always a 5sp conversion too for those that are so inclined.   

[Rick Meredith]

So, should I consider some shorter manifolds?   What will clear best in a stock '67 sedan so I can close the deck lid?

On my '67, 48s on Scat Trak talls fit with a small notch in the velocity stack

[Hotrodvw]

So, should I consider some shorter manifolds?   What will clear best in a stock '67 sedan so I can close the deck lid?

On my '67, 48s on Scat Trak talls fit with a small notch in the velocity stack

Awesome, Thanks Rick.   

[Hotrodvw]

OK, we found it.  Think FK87, but with a bit more duration and ground on a 112deg lobe center.  Should work quite well in a full street trim sedan.  044 casting heads will get a new treatment of 44x38 valves, welded and redone intakes, etc... 

[neil68]

A reminder that vintage Skat Trak manifolds are not exactly the same dimensions as Scat manifolds...it would be worth checking clearances just to be sure.

[Hotrodvw]

I'm not currently using Skats.  Right now, they're the Empi manifolds.

[Hotrodvw]

Re-vistited....!   

Had an issue with the motor. It's now apart, and am re-thinking the c/r for a 'hot street driver'.  We ended up running an SLR EXR-310-106 cam, c/r is at 10.5:1.  I'm going to call Steve as well about it for this cam, but am curious if you guys think it's too high for a street car with occasional trips to the strip. 

Thanks!  Eric

[Taylor]

What kind of issue?   That is a monster of a cam so you should be able to get away with a tad more compression than say a k-8.  I ran that cam and it screamed like a banshee over 5000to but my springs were not adequate and subsequently lost a few lifters. With the same compression as you in my 76*94 it ran 12.50 at 107 here in Vegas.