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Author Topic: 2.4 pistons for 1.6  (Read 10494 times)

January 31, 2008, 05:51:21 pm

andy2

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2.4 pistons for 1.6
« on: January 31, 2008, 05:51:21 pm »
The 2.4 5 cyl (AAB) engine found in the eurovan is non turbo but has oil cooled pistons :wink: .The 2.4 piston is 79.5 mm and the wrist pin is the same size as the 1.6 so if the 1.6 block can handle the bigger diameter piston (76.5 up to 79.5) then you could have a 1.7-1.9 ???Also the height of the 2.4 piston from the wrist pin center to the top when compared to the 1.6 is 2 mm shorter.This helps bring the compression ratio back down if the pistion was used in a 1.6.I still think that the compression ratio would be a little higher that 23:1 but not too much.Assuming a 1.9 head was put on this block then the compression would be lower so it may end up being close to 22.5-23:1.I'm not 100% so possibly someone else could do the math.Anyhow this might interest someone who likes the 1.6er revs but likes the 1.9's displacment.Get some H beam 1.6 conrods too.
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Reply #1January 31, 2008, 10:14:10 pm

gldgti

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2.4 pistons for 1.6
« Reply #1 on: January 31, 2008, 10:14:10 pm »
well done mate! i have a 1.6 block in the shed at home that was left out in the rain for years - might be a good one to test the big bore theory on...
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Reply #2January 31, 2008, 11:07:04 pm

MJF

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2.4 pistons for 1.6
« Reply #2 on: January 31, 2008, 11:07:04 pm »
Thatīs the piston Iīm using  :wink:
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Reply #3February 01, 2008, 06:08:41 am

jimfoo

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2.4 pistons for 1.6
« Reply #3 on: February 01, 2008, 06:08:41 am »
I thought a while ago someone measured cylinder wall thickness and thought it would be too thin after being bored out that much in a 1.6.
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Reply #4February 01, 2008, 09:21:20 am

subsonic

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2.4 pistons for 1.6
« Reply #4 on: February 01, 2008, 09:21:20 am »
Here is some info on some sonic wall testing of the 1.6 blocks that was done.

http://vwdiesel.net/phpBB/viewtopic.php?t=6948&postdays=0&postorder=asc&highlight=sonic&start=0
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1985 VW Golf 5-spd, 4-door, 1.6NA  Bought from orig. owner in Savannah with 42,000 miles.
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Reply #5February 01, 2008, 09:52:15 am

rabbid79

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2.4 pistons for 1.6
« Reply #5 on: February 01, 2008, 09:52:15 am »
How much does a set of these pistons cost, and what brand are they?  Mahle, Kolbenschmidt, other?  Having a smaller pin size than your standard 1.9 diesel piston does have some interesting implications...
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Reply #6February 01, 2008, 06:49:04 pm

jtanguay

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2.4 pistons for 1.6
« Reply #6 on: February 01, 2008, 06:49:04 pm »
wonder if its possible to buy 2.4 TDI pistons... 1.7TDI anyone?  :o
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Reply #7February 02, 2008, 08:45:50 am

andy2

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2.4 pistons for 1.6
« Reply #7 on: February 02, 2008, 08:45:50 am »
Tdi and 1.9td have 24mm wrist pins and the 1.6/2.4 have 22mm pins so I don't think it would be worth modifing.

MJF what crank rods and block are you using if you don't mind me asking?

I was thinking of a possible other combo like 1.9 block,2.4 pistons,1.6 crank and custom rods :lol:
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Reply #8February 02, 2008, 08:53:21 am

MJF

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2.4 pistons for 1.6
« Reply #8 on: February 02, 2008, 08:53:21 am »
Quote from: "andy2"
Tdi and 1.9td have 24mm wrist pins and the 1.6/2.4 have 22mm pins so I don't think it would be worth modifing.

MJF what crank rods and block are you using if you don't mind me asking?

I was thinking of a possible other combo like 1.9 block,2.4 pistons,1.6 crank and custom rods :lol:


Tdi and 1.9td have 26mm and 1.6/1.9na/2.4 have 24mm pins  :wink:

I have AAZ block, 1.9na/2.4 pistons, 1.6 crank and custom rods :lol:
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Reply #9February 02, 2008, 10:46:17 am

935racer

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2.4 pistons for 1.6
« Reply #9 on: February 02, 2008, 10:46:17 am »
Why did you choose to go with the 1.9 NA pistons over the 1.9 td pistons?
I would think you would want the 26 mm wrist pin, no?
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Reply #10February 02, 2008, 01:50:07 pm

MJF

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2.4 pistons for 1.6
« Reply #10 on: February 02, 2008, 01:50:07 pm »
Quote from: "935racer"
Why did you choose to go with the 1.9 NA pistons over the 1.9 td pistons?
I would think you would want the 26 mm wrist pin, no?


AAZ pistons are so heavy :lol: NA piston is also much shorter so, a little better rod/stroke ratio.
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'74 VW Scirocco TD
'86 Audi 80q 1,9TDic
'01 Audi A6q 2,5TDI
Reply #11February 02, 2008, 08:14:35 pm

andy2

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2.4 pistons for 1.6
« Reply #11 on: February 02, 2008, 08:14:35 pm »
My mistake Nick,So the custom rods did you get them made to keep the piston potrusion above the deck to keep the stock compression ratio or did you lower the compression any by making the rod shorter than required?

I take it that they are h beam rods as well?What company made them for you?

Very nice setup anyhow  :wink: .I only stumbled acrross this possibility after inspecting a disasembled 2.4L.So the 2.4/1.9NA pistons are the same do they share the same rods as well?

I wonder if the 2.4/1.9Na rods would work with this combo (1.9td block,1.6 crank,1.9na/2.4 pistons)?They would be a different length than the 1.6 or 1.9TD rods I pretty sure.I should have measured those 2.4 rods :) .
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Reply #12February 02, 2008, 08:23:56 pm

andy2

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2.4 pistons for 1.6
« Reply #12 on: February 02, 2008, 08:23:56 pm »
I wonder if the 1.7L (KY) engine has the same pistons as the 1.9na and 2.4?

I guess the only issue with most of these non turbo pistons is that they may not be ideal for high HP/boost applications?However I supose If they were cryo treated,Creamic/teflon coated that they would hold up fine.
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Reply #13February 02, 2008, 08:27:52 pm

935racer

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2.4 pistons for 1.6
« Reply #13 on: February 02, 2008, 08:27:52 pm »
Quote from: "andy2"
I wonder if the 1.7L (KY) engine has the same pistons as the 1.9na and 2.4?

I guess the only issue with most of these non turbo pistons is that they may not be ideal for high HP/boost applications?


I am pretty sure the 1.7 pistons have oil squirter cut outs, I don't think the 2.4's do, but its been a long time, I have never seen the 1.9 na pistons.

MJF do you have the weigt differences between the 1.9na pistons and the TD pistons?
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Reply #14February 02, 2008, 08:32:28 pm

andy2

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2.4 pistons for 1.6
« Reply #14 on: February 02, 2008, 08:32:28 pm »
2.4 engine /Pistons are oil cooled that I know for sure
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