C20LET nokkenassen

[Corsa_GSi]

Ben een nieuwe LET aan het opbouwen (met GT3040 turbo en nog veel meer spul).

Vroeg me af welke nokkenassen jullie gebruiken.

Ik heb in de huidige motor beide XE nokkenassen zitten.

[freek corsa]

Ik heb eens iets gelezen wat geert gepost heeft over nokkenassen in een LET motor.

Misschien weet je wat ik bedoel ?

Maar ik d8 altijd dat XE nokkenassen goed genoeg was, maar jij gaat iets verder dan gewoon goed, het moet reete snel gaan :P

[Corsa_GSi]

Niemand die hier iets op weet :o

Heb in ieder geval gezien dat CAT cams, Dbilas en SBD (Kent cams) spullen leveren voor de LET.
Waarbij eigenlijk alleen bij de laatste gesproken wordt over andere turbo’s etc..

[Miruni]

Ik heb EVO400 nokkenassen van Vmax erin zitten.
Deze hebben 9,3mm max.lift en ongeveer 2,0mm in B.d.p.

[Corsa_GSi]

Hmm zie op die nieuwe site ze niet meer staan :cry

[InjectTheVenom]

Ik vraag me eigenlijk af of je met andere, zo mogelijk op maat gemaakte nokkenassen nog een lonende hoeveelheid extra vermogen krijgt als je naar Evo310 van VMAX gaat?

[Corsa_GSi]

Denk het wel, maar alles afhankelijk van de komplete setup van je motor.
Maar je nokkenassen zijn wel belangrijk voor de beademing ervan!!

Vandaar mijn vraag over wat er zoal te koop is??

Dbilas
http://www.Dbilas.de

Part No.: 14.050.013
Application: Sport C20LET

Duration 268
Peaktiming 112
Valvelift 10,7
Liftat TDC 1,1
Valve timing IO/IC – EO/EC 22/66 – 66/22
Price €New 587.17
Spring set Standard

Part No. 80.000.018
Vehicle type Opel / Vauxhall DOHC 16V C20XE Motronic M2.5 (NEW! Completely aluminum)
Diameter 126.0 mm
Price € 249.90

http://www.catcams.be
Part No. 4600748
# ONLY for dirt track applications and pro street use with adjustable engine management or carburettors

INTAKE
clearance [cl] 0.00mm
duration [0.1mm+cl] 267°
duration [1.0mm+cl] 228°
valve lift [cl=0] 10.95mm
cam lift –
peak angle 112°
timing [1.0mm+cl] 2/46°
lift at TDC [cl=0] 1.25mm

EXHAUST
clearance [cl] 0.00mm
duration [0.1mm+cl] 257°
duration [1.0mm+cl] 215°
valve lift [cl=0] 9.90mm
cam lift –
peak angle 112°
timing [1.0mm+cl] 39/-4°
lift at TDC [cl=0] 0.60mm

Part No. CSK5058 (set)
Astra / Calibra / Kadett / Vectra (-1993) 4 cyl-16v Mot.C2.0XE
CAM TYPE dohc dth
TEETH / shape 42 / circular
DIAMETER (outside) 125,50mm
WIDTH 27,10mm

Quote:
Originally Posted by vbi
I did an “home made” comparison of the LET and XEV cams.
I used a caliper and a goniometer.
Both cams have a duration of 120°
The XEV cam open (and close) 5° after the LET cam.
You have to regain that 5° of advance (overlap).
A tooth on the LET/XEV pulleys is 7.8° (360°/46 teeth)
For that reason the cheapest setup is to retard 1 tooth.
I tried on stock marking but didn’t felt a big change and had a flat spot at low rpms.
I then set mine on a vernier at around 7° and feels good.
Haven’t tried other setups.
Double the values if you prefer to talk of crank degrees.

Other usefull infos I have found so far:

LET lift is 8.5mm
XEV lift is 9.2mm
EDS lift is 10mm

Most of the x20xev cam you found around have the same code (R90400056) both for inlet and exhaust.
The inlet have an ident of “H” and an ident of “I” for exhaust. You found that code stamped on the outer ring of the cam.
Dunno the differences between the 2 as they look similar.

Cam timing is always quoted in crank degrees for good reason.

The xe cam has 4° more duration than the let
The xe opens 6° before the let (sorry I quoted exhaust cam originally which is 12°)
The xe cam closes 2° before the let cam.
The xe cam has 33° of overlap and the let has 27° so 6° more.
The xe cam has 9.5mm lift.
One tooth is 15° so half a tooth is ideal at about 7°

The exhaust cam is different again.

One tooth has also been known to cause emission problems as mot time due to the excess overlap blowing unburnt fuel into the exhaust.

Hopefully that clears up any confusion, half a tooth will work best.

http://www.max-boost.co.uk/max-boost/cylhead/cams_C20LET.htm

http://www.totalvauxhall.co.uk/resources/totalvauxhall/TOV76.tech_LPDF.pdf

Graag meer info over andere opties en mogelijkheden?

Kan van de EDS inlaatnokkenas geen specs vinden.

Daarnaast heeft SBD ze voor de LET (worden gemaakt door KENT cams).

http://www.sbdev.co.uk/Camshafts/Camshafts_20/Camshafts_20.htm

The HT01 Hydraulic turbo cams for the 2.0L LET engine are a nice upgrade from the standard cams they have the potential with right Turbo and correct ansilaries to produce bettween 300 to 350BHP.* It is possible to use standard valve spring and cap assembly but with higher boost pressures we would uprated Caps and platforms with double valve springs
Inlet
CM16V2-HT01IN 2.0L 16V XE Inlet Turbo 260 cam 10.13mm lift 115 degree duration
Exhaust
CM16V2-HT01EXS 2.0L 16V XE Short Exhaust Turbo 260 cam 10.13mm lift 110 degree duration

The MT01 is a mechanical profile design for a seriously modified LET engine with a large enough Turbo / Intercooler and suitable mangement system would capable of producing over 400 BHP
Inlet
CM16V2-MT01IN 2.0L XE 16V Turbo inlet cam – Mechanical with 288 degrees Duration timed @ 110 Degrees. 10.16mm Lift with 0.41mm Clearance
Exhaust
CM16V2-MT01EXS 2.0L XE 16V Turbo exhaust cam distributor – Mechanica with 288 degrees Duration timed @ 110 Degrees. 10.16mm Lift with 0.41mm Clearance

Alleen ga ik niet mechanisch rijden :hmmz

[Auteur]

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