Holden Motor Question

Well pulled the head off the 202 and the bores are good enough to rebuild but shes got her problems. Piston No.3 is broken off completely just above the gudgeon pin. It needs rings all round (suprise, suprise) but it appears that its been bored out .080" (it says 080 on the pistons) which isn't a problem reliability wise but parts wise I can't find anything. They guy I got it off said that a lot of people at mechanic shops would buy lots of 80thou kits and when they rebuild an engine they'd bore it out to 80thou everytime. Its been played with cause its also got a Low Compression head and it should have High Compression but that doesn't matter cause it's going in a Landy. The metal timing gear is a helical cut gear not straight cut so that makes me happy. I don't want to spend a mountain of money on it though, so I'm after a second hand 80thou oversize piston and a full set of 80thou oversize rings and probably bottom end bearings to be on the safe side.

80" is a big oversize. At the limit of what it'll do. If it needs boring or even a good hone I'd look for another donor block. At 100" you get random break through of the liners into parent block material. You can sleeve but finding sleeves these days might be like finding Unicorn man juice.

Try the following.

Russell Engineering PTY LTD
113 North Rocks Rd, NORTH ROCKS, 2151
NSW, AUSTRALIA
ph: +612 9630 2195
e : russellengineering@bigpond.com

A lot of references to having something to do with the 80thou pistons.

ACL make a "race" piston thats good for all use, Mahle make their pistons now and don't seem to care too much about Australian old stuff. Just cc the heads to make sure they match. There may not be rings available though but toyota 3F rings fit 60", may do 80" as well. Part no's as follows.

ACL Rings # PS1357-XXX XXX = size, std, 010, 020, 030, 040, 060, maybe080

Federal Mogul ring #E-654KC XX (size)
also big end # 6-3710CP-XX (size(under))

Precision Internal Rings. Note you'll need to machine the ACL grooves to suit. 0.004" from the top, 0.030" from the oil. Use a 1/16 cutter for the top groove, 3.6 for the oil.

Part No - RS3625ML6 - 065

Hastings chrome rings for a 3F toyota landcruiser engine in stock bore size will be a direct fit. Just need to file back.

Part number is RS1705CR6 - STD.

Std 3F bore size is 3.7008, +.060" 202/253 is 3.685", so they are for a .015" larger bore & gap down well.

ACL piston numbers
202 Red 6 6MKRY9096 ƒ Bowl
6MKRY9118 ƒ Flat Top

202 Blue/Black 6 6MKRY9096 ƒ Bowl
6MKRY9118 ƒ Flat Top

Having broken a rod, it's usual anyway, I'd be line boring the mains. Just a common practice for them but if it's been out of whack and shattered more so.

These guys on ebay have a lot of rings and stuff to suit, they say contact for sizes.
eBay My World - autopowerpartsonline


NOTE: These might be a good buy. Not mine just found while looking.

ACL Duralite 202 pistons std bore with rings NEW $200 neg.
Holden 202 pistons std | Engine, Engine Parts & Transmission | Gumtree Australia Cardinia Area - Nar Nar Goon North

ALSO high Vol JP oil pump. Good mod $60-
Holden 6cyl 202 - 161 RED MOTOR jp oil pump | Other Parts & Accessories | Gumtree Australia Caboolture Area - Sandstone Point


THESE are another option, can be spec'd in size to order. So if the bores are ok and you want to go +80"
Holden 202 6Cyl Piston & Rings Kit - Flat Top Pistons & Hastings Moly Rings | eBay

They have a bunch of stuff for them as well. Just please don't use ACL or monotorque head gaskets.

Hope it helps. If you want to source another block let me know, I can probably scrounge something up and throw it together.

I thought a 202 bored out to 60 thou was pushing the limit, at 80 those bores would be thin, if you can find a blue motor 3.3 from memory they had star fire con rods as well as a solid steel crank, electronic dizzy and 12 port head. I picked 1 up a couple of years back from a wreckers that was running for $250 and it was EFI so that included the ecu and electric fuel pump. you would think a carbie motor could be found for $200 or less. Try gumtree I've found there are a few bargains on there.

Cheers Chris

Thanks for the replies, apparently you can bore them out to 120thou without hitting water but you need a sleeve for it. The bores are good enough to keep the block and it doesn't need boring out but a little honing just to remove the small lip thats probably just carbon cause the other pistons still fit and they had a lot of carbon. I can't afford sleeves or major work but another piston, rings, head gasket and maybe bottom end bearings is my limit. I'll try and get pics up soon. I can't even get a stuffed red motor for $250 let alone a blue motor. Are there any pistons that would fit from another car that are easier to find? if i could get a piston from another car that fits the 80thou oversize and thats standard size for the donor engine? I was thinking along the lines of a 3.8 V6 piston maybe something like that.

What you really want is a black 202 with blue 202 rods. The black has a steel counter weighted crank and the blue rods were from XU1 stock. Black head is 12 port and has unleaded valve seats.

I think you'll really be pushing it uphill to find any 80" pistons. Last records I can find of stocks being readily available was back when HQ racing was in fashion.

I can't afford a 202 black or blue let alone find one. I think I can find the right piston and rings cause apparently it was and still quite common for a mechanic shop to bore them out to the max and put the same kit through every motor to make it cheaper for them. Could I find a 60thou piston and add the 80thou rings cause you don't have to get bigger pistons when you get a 20thou bore out.

I wouldn't make a habit of it. I've never heard of anyone running a std or next undersize piston in a +20" bore. It'd slap harder than a bar wench without a tip.

These engines are a dime a dozen here. Can be found for <4200- with full efi attached or around $100- bare.

Quote:

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Originally Posted by Series3 GT

That's a cool setup, I might do that eventually but I might look at a 302 or 308. Then again a 253 is certainly enough for a Series. Are you running standard axles/diffs? I love the idea of a Nissan box with a Series t/case cause the Nissan is strong and smooth and the Series t/case is srong and has very low gearing, perfect combo. 202 should keep me happy for now but in the future I'll probably look at the V8 again.

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I have the standard front diff & salls rear..

My green one runs a BLUE 202.Whats yours if its the blue ditch the varajet carby they are very very tempremental..My 202 is bored 60tho has aftermarket cam & crank & rods.Stage 3 engine.The crank & cam are an old brand that they dont make now there JP from memery Or PJ Peter Jackson yeah thats it..I also run a holley 350.its all ballanced & the head was all done for unleaded & all ported.The blue & black engines are very tempremental blue more so.With all the vacumn crap on them they must be in perfect condition the slightest leak & you'll have trouble..The black engine was the first holden to get fuel injection & are a good engine & better if you take all the polution gear off..Also use an electric ignition there so much better..I had rebuilt the red 202 in my tray back aswell but now using the 253..When you go the V8 make sure you know what stud pattern the block is before buying 308s have a trimatic & a turbo bolt pattern.Some of the late 253s are the same..I'd say i'll endup doing the 253 up with bigger pistons crank ,Cam & rods..Also remember if you have ACL pistons you HAVE to use ACL rings cause if you use others there wont be enough back spacing & after runing for awhile it will just stop dead..I love holden V8s i used to build a lot of 355ci engines outa 308s.You can use Crysler cranks in a 308 aswell with the rod..:D..I just gave the rebuilt red 202 away to another member as i didnt need it now same with the rebuilt series 3 gearbox.dont need em now & taking up to much room...

To get around the ring land sizes see my earlier post about opening up the grooves.

I remember many years ago people would use pistons from either a 180B or 200B Datsun, I don't remember which, but they were about +0.060" and had the same pin dia & height. I don't know if they are still available, but someone on here should know. It may be in an older thread.

Also I believe the Black Motor was not originally made for unleaded, I thought it was replaced with the RB30 Ni**an motor rather than re engineer it to run ulp.

Jeff

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