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

[Hotrodvw]

I had intake valves hitting the 3/4 pistons due to  cyl. head issues...  I split the motor to dbl check everything, and am pondering the c/r being ideal.  Cam is very torquey, esp. on the 106lc.  Heads are heavily portted 44x37.5, 55cc chambers, @ 10.5:1.

[stealth67vw]

I had intake valves hitting the 3/4 pistons due to  cyl. head issues...  I split the motor to dbl check everything, and am pondering the c/r being ideal.  Cam is very torquey, esp. on the 106lc.  Heads are heavily portted 44x37.5, 55cc chambers, @ 10.5:1.

I think you did your math wrong somewheres. 10.5:1 with 55cc chambers is only .011" deck. 50cc at .040 deck would give you 10.5;1 or 55cc and .040 deck (bare minimum) would give you 9.7:1.

[Hotrodvw]

I didin't do the math........I was told deck was .000", had a .040" an a .020" shim under the cyl, and a .040" head gasket.

[fish]

My mate ran Pauter V9E0/scat lifter in 78x94 5.5 rods, IDA, welded 42x37.5 heads really nice power delivery, changed to 82 crank 5.7 Carrilos and the thing screamed.
I am thinking of running the same cam scat lifter combo in a 82x90.5 combo. Like Udo said horse power is in the heads if thats what you are chasing.

cheers
ben

[stealth67vw]

I didin't do the math........I was told deck was .000", had a .040" an a .020" shim under the cyl, and a .040" head gasket.

.000 deck + .040 head gasket + 55cc chambers =9.7:1

[Hotrodvw]

I'll probably be ordering either CB wedge ports, or Steve Tims Stage 2 heads or similar this week.

[Udo]

My mate ran Pauter V9E0/scat lifter in 78x94 5.5 rods, IDA, welded 42x37.5 heads really nice power delivery, changed to 82 crank 5.7 Carrilos and the thing screamed.
I am thinking of running the same cam scat lifter combo in a 82x90.5 combo. Like Udo said horse power is in the heads if thats what you are chasing.

cheers
ben
[/quote

E0 has 110 lobe . I would recommend V4E8 and good heads ..

Udo

[Hotrodvw]

I didin't do the math........I was told deck was .000", had a .040" an a .020" shim under the cyl, and a .040" head gasket.

.000 deck + .040 head gasket + 55cc chambers =9.7:1

That's funny....I don't know what the hell he did then.  Starting over! LOL

[Hotrodvw]

So if I leave the deck at .000", and use a .040" head gasket, I should be able to dial in my desired C/R by manipulating the heads via chamber size and fly cutting, correct??
I'm shooting for 9.5:1 C/R, as per Steve Long over the phone yesterday.
 

[richie]

So if I leave the deck at .000", and use a .040" head gasket, I should be able to dial in my desired C/R by manipulating the heads via chamber size and fly cutting, correct??
I'm shooting for 9.5:1 C/R, as per Steve Long over the phone yesterday.
 

eric

I use this engine calc to figure everything out

http://www.johnmaherracing.co.uk/enginecalc.htm

enter all your details and it gives you rthe answers

with 0.040 deck and 55cc,78 stroke and 94mm bore it gives 9.7/1, then 57cc gives 9.5/1 or 55cc and 0.048deck

 
cheers richie

[Hotrodvw]

Thanks Richie 

[Shag55]

Eric, the copper shims do crush a little and if you have a STD type 1 main crank it does flex a little. Also wiu the cam ground on 106lbc the valve event is earlier so you have less valve to piston clearance.

[Hotrodvw]

Do you think O should run Bit more deck to be safer???

[richie]

Personally I think with only a 78 crank 0.040 is fine,all the copper shims I have ever measured are 0.042 thick anyway,you would just need to check valve to piston clearance,from the info you have given I am thinking there is actually zero deck with the copper shim,did the piston hit the head?

cheers richie

[Jesse/DVK]

I have a 78.4 x 94mm with steve tims stage 2 plus heads with 86c. Rund very nicr. 190 hp at the crank with 37 vents in ida. Cr is 10.7:1 high torque also 230nm

[DKK Ted]

An Engle 125 on 106 LC with 1.25 rockers.

[bugnut68]

An Engle 125 on 106 LC with 1.25 rockers.

That's what I gots for my 2017 build...  I basically copy-catted the Cal Look engine in Hot VWs circa 1995... but instead of 40x35.5 Fumio heads, I've got the Tims Stage II's.

[Zach Gomulka]

An Engle 125 on 106 LC with 1.25 rockers.

That's what I gots for my 2017 build...  I basically copy-catted the Cal Look engine in Hot VWs circa 1995... but instead of 40x35.5 Fumio heads, I've got the Tims Stage II's.

You giving it some compression this time around?

[Bendik]

An Engle 125 on 106 LC with 1.25 rockers.

That's what I gots for my 2017 build...  I basically copy-catted the Cal Look engine in Hot VWs circa 1995... but instead of 40x35.5 Fumio heads, I've got the Tims Stage II's.

Off topic; wich issues was this in? Was it also in the engine book?

[bugnut68]

Zach, looking at right around 9:1 or theres about.  Maybe a little higher, it's not a daily driver, more of a seasonal toy at this stage, so I'm sure I can get away with a little more, especially at elevation 4,800 feet.

The Hot VWs engine build was in the 1997 engine book (Part II) in its entirety.

[Hotrodvw]

So, the final update is this:  I"m not sure what the hell he did for deck and c/r.  I had a .000" deck at the cyl, and (2) .040" copper shims in the heads.  I'm also thinking the c/r was in the 9.5-9.7 range.  I tore it down myself and re-built it myself.  If the shit hits the fan, it's on me.  

I kept with the zero deck at the cylinder, and used (1) .050" copper shim (assuming it'll crush to about .047").  This puts me at 9.4:1.  I figure it's a safe yet very fin c/r for what I'm after.  I can always change it some other time.  I went with Tims Stage 2 plus heads, with new match ported CB big beef manifolds, top to bottom.  I did check the valve to piston clearance with some play-doh, have lots of room.....prob could have sat that c/r down a bit more!    We did check the lift at the valve, and got.607" with my Autocraft 1.4's.  I was pretty impressed. Took it for a spin last night, seems to run great!  Thank guys for your input and support.  

Eric    

[DKK Ted]

On my new 2303cc I have "0" deck with .060 copper head gasket. No problem. Minimum  you want to run is .040, .050 is fine, as long as the numbers you want work out, Sounds like a real nice motor. Didn't read what cam you ended up with? But did a motor for a guy, 2275cc, used a K-8 on a 106*LC and advanced it another 2*, runs like a bat out of hell, tons of torque. Talk about fun on the street!


Ted

[Hotrodvw]

Cam is an SLR xr310-106

[DKK Ted]

I've ran that cam, a hard weld cam, on the same 2303cc w/ V-7 heads from Fred Simpson, got it from Babe Erson when he was still with us, of course Steve was working with him at the time. I had advanced that cam 4*, still made 200HP @ 6500rpm, thats a GREAT cam. Not so hard on lifter bores.

Ted

[Hotrodvw]

We chose it because I was aiming for the bottom end torque, but we set the cam at zero.  Do you think I should advance it some day?  I'm curious what kind of difference it would make.

[DKK Ted]

Yes, for sure, that cam is between a K-10 and a 86C cam, it's more mid to top end cam. You advance it, will bring the power down more, I would advance it 4*. You will see a difference.

Ted

[Taylor]

Before you said it was an EXR310 now XR310, just curious which you went with?   

[Hotrodvw]

XR310-106.   I goofed by adding the "E" to the prefix.

[andy198712]

Yes, for sure, that cam is between a K-10 and a 86C cam, it's more mid to top end cam. You advance it, will bring the power down more, I would advance it 4*. You will see a difference.

Ted

Hi Ted,
Just to expand on this, by advancing a cam, would that mean the intake is opening sooner and closing sooner?
Just thinking in terms of volumetric efficiency (or trying to) does the best filling happen early in the stroke? Ie get it open ASAP or better off leaving it open later and longer?

Hoping the answer wil help us mortals understand it a bit better.


Did you measure intake runner length in the end?

[Hotrodvw]

I didn't measure it. CB Big Beef manifolds if anyone knows.