Mechanical Terminology

[95TacoTruck]

I was reading an article which stated that if I take my 83 block and deck it 2mm it will be identical to the 85 block, Im assuming that decking is taking 2mm off the top but Im not positive.  someone please clarify and if so would any machine shop be able to do it

[WHITE_TRASH]

you got it :thumb:bt deck they in fact do mean the head sealing surface of the block.  and yes every machine shop should be able to do it.

[cruzila]

Sooooo.......what the   are you gonna do run race gas?

[84runner]

Crusila has a good point you messin with compression there big guy.  More compression measns more power but to much means pinging. Check that compression ratio.

[gferris5]

Nah, deck it .020 and then run two head gaskets.  I'm kidding of course.  It'd be so nice to think that you can just do one thing at a time to a motor and be like, voila, performance, but once you start with some goal like a higher compression ration, you're looking at such a greater commitment of other parts and ultimately, money.  Now, it is a good idea to have it decked, honed and all that if you're doing a rebuild if it needs it, just send your bottom end to the machine shop so the don't end up building you something to run on alcohol or diesel.

[brainlessfool]

Soooooooo any ideas on how much decking the block 2mm will rise the comp. ratio? ball park? from stock of say 8.5 to?

[Cracker]

This is just a guess, but I think I remember hearing some where between 10:1 & 10.5:1....

[gferris5]

it depends somewhat on your pistons too, what are your actual plans for the motor?

[tonka]

it will put your conpress the same as an 85. .020 is hardly any thing. if your going to do that then get on 85 head. they have better flow. you will see a difference in power.

[95TacoTruck]

Yes it would only put the compression where an 85 Should be so it wouldnt be a big thing.!

[5spd]

Have the timing cover done at the same time, dont want to shave the block and find that the TC is to tall now...when you try to put the head on...

[79coyotefrg]

it will put your conpress the same as an 85. .020 is hardly any thing. if your going to do that then get on 85 head. they have better flow. you will see a difference in power.
 

he said 2 mm,  not  .020
if you mill your block 2mm you will have   12:1 compression or higher depending on your pistons

[79coyotefrg]

but yea if your going to use a 85 head ,

[cruzila]

My thought on the 2mm was piston hitting head wham! Dang where is that atom bomb smiley


.020 is .5mm. Certainly that should be within factory tolerance.

[cruzila]

OK

[brainlessfool]

ok. So .020= .5mm. so then 2mm=.080 0k thats not to big a decking:ack: how about the chain slack? you'll have an extra .160 of chain to take up too

[mr4x42u]

doubt it so you should run a adjustable timing gear so the cam advadance will be right..The tensioner will or should take up that slack but the cam will still be off...

[79coyotefrg]

the only way 2mm could be taken off that 83 block is to use the 85 head, but would still would have to have the adjustable cam gear, if you want more flow than your 83 head gives,  dont go with the 85 use a 20 r head and intake, and a 38 weber, lc headers,
you, would have to use 85 model pistons too

[79coyotefrg]

My thought on the 2mm was piston hitting head wham! Dang where is that atom bomb smiley


 :thud:like a sledge hammer
if it didnt hit,  he'd have to run nitromethane fuel

actually the picture i have in my head is a toy hood with little bitty peices of head sticking out

[84runner]

Call LC Engineering and speak to a tech there, that would be your best bet.

[cruzila]

and I thought this thread was going to be about tech terms. or not so tech terms, you know like what do call this:
thingy
do-hicky
screwy screw
etc.

[brainlessfool]

Well ok, I found this"thingy" under the awwww hood? of the truck. Its kinda dirty and got some oil in it and water too. how can this be?  Oil and water dont mix.  and its got these rubber ropes? going around the front of it. rubber tubes too, some going to the front of the truck and some small ones going to the back. any ideas?  well I am brainless:hahaha:

[84runner]

I found this thingamajigger on mine right next to the blinker fluid resvor, just above the fuel injected brake lines, right between the duel chrome dipsticks. Its getting hot from the muffler bearings, any help identifying this thing would be great, someone said a canuederod, but I'm not sure.   :scratch:

[WHITE_TRASH]

why do you feel you have to ruin this post with stupid questions like that 84runner???
its a piston pull back spring every A.S.E. mechanic knows that

[cruzila]

Ah, yes we digress into complete chaos..............

[gferris5]

OOh, you guys are all talking about the ever suspicious rotary girder, which is next to the radiator timing device.  try to keep that in mind.  Oh by the way, I'm the only one who said anything about decking it .020 cause that sounded reasonable.  whereas decking it 2 millies would definitely cause the rotary girder to explode.

[84runner]

Ya I called the dealer and asked them. The proper term White_Trash is "piston return spring"

[WHITE_TRASH]

Dangit wring again dont worry im sure itll happen again