choice for a camshaft

[saltgrinder]

Hahahahaha
Yes to everything you said
Yep I'm trying to get 40 series pistons .
funny , I now have to go to scoobydoo dealer in the morning to get some parts for wife's wrx so while I'm there I might stir the pot , hehehehe
I have to sit down and work some numbers for stroke and what not , not my strongest attribute , I'm only a spraypainter

[Piledriver]

The main things you need to know when calculating t4 engine bits:
Stock deck (top of jugs with no spacers or gaskets is ~202.5mm.
Decking the case reduces that (a little), spacers make it wider.
Going narrow is harder than wider, jugs need shortened, pushrod tubes etc.

Going much wider than ~3mm/side makes fitting stock cooling tin progressively harder.
(up to ~3mm is fairly easy)

2L rods are 131mm long, 71mm stroke, 50mm rod journal, 26mm wide. (almost same as Dodge 2.2L//SRT4 rod bearing, rod can be modified, thank you type4unleashed, much better choices in bearings)
1.7/1.8 are 127mm long, 66 stroke, 55mm rod journal, ~26mm wide. Ti diameter but wider. 42mm compression height.

Stock 2L piston compression height is 36mm. (center of pin to crown)

...So...stroke/2+rod length+piston height=actual deck
2L: 71/2+131+36=202.5mm, usually leaves the piston almost even with the top.
1.7L: 66/2+127+42=202 usually leaves the piston .5mm down the hole.

[saltgrinder]

Thanks for that info , makes it a bit easier for me to come up with a plan
I'm keen on a stroker but It seems a shame to not use some factory parts I have stashed away as there have been some good results on the forum

Richard

[christo]

Saltgrinder, Any updates on your build ? curious people need to know

[_flat4power_]

Hi,
My engine case is back.
I plan to send it for control and modification this week.
I have a new question about camshaft
The bas 296 ( schleicher ) ? Can someone give me a return ?

[_flat4power_]

Hi,

I come back after long long time because lot of other projects.
My T4 case is ready
My project is to install a turbo in my bus.
Is the 86a a good choise or do I prefer the 119 ?
thanks for your help

[Piledriver]

The 119 has a bit more lift, is slightly more aggressive ramps, the 86 setries is based on the profile of an "OEM" cam, I assume GM Duntov Corvette, the various 86x versions are differently scaled variants, but following same accel profile.

The 119 requires dual springs.
They are a good idea with the 86a, as it can (depending on heads etc) pull rpm so you will probably float hd singles after some use.

[CLKWRK]

I have been using beehives with the 86a, and 23psi boost with no float

[Piledriver]

Good to know, those are just about perfect.

[CLKWRK]

the 86a doesnt need high rpm, mine was all done at 6500rpm on the dyno

[_flat4power_]

thanks for your help

[Ephry73]

The big bit me again.

Interesting topic as always. Does CB Performance still sell the Jenvey style throttle bodies? I read
That megasquirt has gotten so much better and HEI available now it should be the way to go. Dual spark and a bit more timing.


Sent from my iPhone using Tapatalk

[_flat4power_]

the 86a doesnt need high rpm, mine was all done at 6500rpm on the dyno

can you detail your configuration ?
75x103
86a
CR 9:1
cooling fan ? original t4 -- porsche ...
cylinder head ? valve size ?

[CLKWRK]

fairly stock 2.0L 94x71 with stock 1.8L "s" heads
cr is 8.2:1 with gt2860rs turbo
air/water intercooler and methanol/water injection
web 86a with 112LC
cooling is converted to cali upright style
using electromotive efi

[_flat4power_]

awesome results

do you think if it is possible to have more torque and HP at low RPM ? with an other turbo model ?