choice for a camshaft

This is the place to discuss, or get help with any of your Type 4 questions.

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saltgrinder
Posts: 33
Joined: Fri Sep 23, 2011 12:27 am
Location: South West OZ

Re: choice for a camshaft

Post by saltgrinder » Fri Feb 24, 2017 5:25 am

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

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Piledriver
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Joined: Sat Feb 16, 2002 3:01 am
Location: Van Alstyne, Texas

Re: choice for a camshaft

Post by Piledriver » Fri Feb 24, 2017 6:13 am

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.
I, for one, regularly embrace our new robot overlords, as I am the guy fixing the robots...

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saltgrinder
Posts: 33
Joined: Fri Sep 23, 2011 12:27 am
Location: South West OZ

Re: choice for a camshaft

Post by saltgrinder » Sat Feb 25, 2017 10:44 pm

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
Posts: 24
Joined: Tue Jul 21, 2009 5:39 pm

Re: choice for a camshaft

Post by christo » Sat May 06, 2017 7:34 pm

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

_flat4power_
Posts: 8
Joined: Fri Feb 10, 2012 8:10 am

Re: choice for a camshaft

Post by _flat4power_ » Sun Oct 01, 2017 7:19 am

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 ?

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