does anyone know if a toyota 2y crank been crammed into an avenger block, we lined the cranks up & they're almost identical in bearing spacing & the jap crank almost drops straight in. the nose & tail are a bit different- ie 6 flywheel bolts compared to 5 & modify nose to fit avenger timing gear, though engine builder reckons he can work round those issues
toyota crank has a 77 mm stroke
Have heard of Toyota pistons being used, not the crankshafts! Even if you get the bearings and timing gear sorted, with a 77mm stroke the pistons will be popping out of the block! Standard 1500 stroke is 64.3mm while the 1600 stroke is 66.7mm and with the 1700 stroker kit on eBay it's 71mm. The 1500 and 1600 blocks are the same so a 1500 one can be bored out 1.21mm to use 1600 pistons as Richard did.
http://www.ebay.co.uk/itm/Avenger-Tiger-Talbot-Sunbeam-Ti-Crankshaft-Piston-Bearing-1700cc-Stroker-Kit-/271809182018?pt=LH_DefaultDomain_3&hash=item3f4916f942 (http://www.ebay.co.uk/itm/Avenger-Tiger-Talbot-Sunbeam-Ti-Crankshaft-Piston-Bearing-1700cc-Stroker-Kit-/271809182018?pt=LH_DefaultDomain_3&hash=item3f4916f942)
I was told you could also use these. 88.9mm which will give you about 1656cc. also gives higher compression
http://www.ebay.co.uk/itm/PISTON-FOR-VOLVO-242-244-245-340-343-345-360-760-B19A-B19E-10-TO-1-CR-2-1977-198-/161450491334?pt=LH_DefaultDomain_3&hash=item259732fdc6 (http://www.ebay.co.uk/itm/PISTON-FOR-VOLVO-242-244-245-340-343-345-360-760-B19A-B19E-10-TO-1-CR-2-1977-198-/161450491334?pt=LH_DefaultDomain_3&hash=item259732fdc6)
I have used 2T Toyota pistons at 90mm which gives 1696cc and also 88.5mm giving 1640cc. To use these the little end bearing in rod needs to be reduced in size and a lot...about 5mm needs machining off the block.
Re longer stroke cranks, I looked at Nissan L16/L18 cranks a few years ago and they looked very promising, but the big problem with Avenger blocks when considering a longer stroke is that the block is not tall enough (Brazilian blocks are about 10mm taller for this reason). Using short rods is possible but this will reduce the rod ratio (which is already low) and that is not desirable for optimum efficiency.
I now use 89mm Nissan Pistons, these have a high pin position that allows longer rods which come from a Toyota 3sgte, the gudgin bearing needs sizing down. The Avenger crank is very strong and as the Toyota big end bearing is smaller than the Avenger, the crank is ground down to suit and also offset to make a stroke of about 68mm so the capacity is 1697cc.
The biggest problem I am having is getting a block with thick enough walls to take the overbore and so I have 1 sleeved bore on my current engine and I might need more.....
shoot thats cool info
the hunt continues for a crank to butcher,- they're hard to find, most toy motors seem to have been exported by the scrappies or still smoking their way down the road.
did price that ebay stroker kit- @ $1900nz including freight & fees/tax etc to my door, tempting but we are keen to give the 2y a go for the hell of it
FINALLY scored a crank, not the 1 i was chasing- engine builder figured if we're going this far may as go all out so its a 3y, @ 86 mm stroke. Dropping the crank off on monday- the fun begins!
Heres a pic of the 2 cranks, avenger on top
(//)
Dammit, cranks in- just a bit too tight- block will need chunks ground out the sides for clearance for the rods
At this stage capacity works out @ 2.1L. biggest hassle may be the need to make a custom flywheel, wasn't unexpected though.
Might FINALLY be close to getting a suitable crank- hopefully motors supposed to turn up next week then it's all go engineering the improbable :o
Promises promises, >:( still without the right crank, all the other bits are now at rebuilder including my no. 2 block which has thicker walls than the 1 we were gunna use.
The 3y crank will still help with how much to narrow the centre main bearing & work out thrust bearing placement etc- if the y crank didn't have a bevel at the back the standard avenger thrust location WOULD have worked.
'following'
Seems all i'm doing too, following leads & dead ends, got offered a 1y- 1600cc hardly worth the effort as it's only @ 4mm increase over a 1600 avenger crank
That's 1677cc...similar to the eBay '1700' stroker kits that were actually only 1683cc!!
If enough meat..the Toyota big ends could be offset ground 40 thou (1mm) to get 1697cc.
GOT A CRANK!!!!!!!!!!!- not the 1 i was chasing, this is a 3T- still fits just the same, actually its better in that there's more metal for thrust bearings in standard avenger location, y series has a big chamfer there which entailed sussing out an alternative location for them.
Belated update, bit of a bum steer guys, 3T not so suitable rear main journal smaller than avengers. Been back on the hunt for a 2Y,just found a whole motor on trademe pick up next weekend is the plan then get it built.
You can get Chinese cranks out of many suppliers on Alibaba, there is even a fully counter weighted steel one there.
Your engine guy should know this, but be careful your piston is supported properly at the bottom of the bore at BDC. often overlooked by people adding stroke...
Did have a look at that a while ago. Whole engine got me rods/pistons/thrust bearings too. Rods @ same length as avengers, 2y piston pin height is almost suitable for the job/ diameter not enough for the bore we're running.
Should keep builder buzy sorting it all out
Little bit happening now, 2y crank's been welded adding some meat so we can use standard avenger thrust bearings in their stock location, easier than modding the block to suit the crank.
Next, trim center main to suit 2y's slightly narrower journal.
Crank will be ground to suit std avenger bearings then start planning a custom flywheel.
It's probably been mentioned but you 'could' almost custom make your own crank for what seems like all the work thats gone into this? or am I thinking Cam's , I've seen a guy make his own once, but yeah I appreceate cnc Mills/ lathes are not exactly cheap either
no matter what : I like the direction this is going & do not let me put you off!
The welding is only a thin ring to get rid a chamfer on toyota crank so avenger thrusts have enough to run against. As for other crank work it's basically grind jounals to required sizes, hack off 1/2 the nose & drop it in
ahh see little secrets like that are magic when I have no actual metalworking skills!
The Crank is in the BLOCK!!!!!!!!!!!!!
Me is soooooo HAPPY. Coming together now, big ends to grind next!
Pics to come later.