Also- what rings are everyone using?? Also what is the best way to
buy a set? Does this mean I'll have to buy 2 sets of rings to have enough
to cover 6 pistons?? Since the pistons come in sets of four...???
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| ?'s for racers using the long rod 225... https://slantsix.org/forum/viewtopic.php?t=16563 |
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| Author: | featherduster76 [ Tue Mar 14, 2006 6:51 pm ] |
| Post subject: | ?'s for racers using the long rod 225... |
I have located a set of 198 rods and am getting with the owner soon for pricing. What Id like to know is what pistons are you using-kind,size and overbore and the approx. compression ratio you are pushing with your combo. Im looking pretty hard at a set of KB silvolite pistons which are #KB239. Anyone have a pretty close guess at what the compression ratio would be with an unshaved head??? |
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| Author: | featherduster76 [ Tue Mar 14, 2006 7:14 pm ] |
| Post subject: | |
Also- what rings are everyone using?? Also what is the best way to buy a set? Does this mean I'll have to buy 2 sets of rings to have enough to cover 6 pistons?? Since the pistons come in sets of four...???
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| Author: | DusterIdiot [ Tue Mar 14, 2006 7:27 pm ] |
| Post subject: | You'll have to measure... |
I think an unshaved head gets anywhere upwards of 10.1-10.8:1 depending on deck height and other factors... I did a 'rough out' on the long rod block I got a while back, and I'm having my pistons dished per Doc's sketch...the calipers told me the pistons might pop out of the hole +.06 (the previous owner decked the block I think). The setup came with Hastings rings (yep, 8 sets). good luck, -D.Idiot |
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| Author: | Terencejiminy [ Tue Mar 14, 2006 7:50 pm ] |
| Post subject: | 198 rods |
are there 2 sizes of the 198 rod? One for the older wide throw forged crank and one for the last /6's, narrow throw cast cranks? Is Doc's sketch of the piston Mod's handy for me too?  Thanks Terry |
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| Author: | SlantSixDan [ Tue Mar 14, 2006 8:02 pm ] |
| Post subject: | Re: 198 rods |
Quote: are there 2 sizes of the 198 rod?
No, only one type of 198 rod. There were no cast-crank 198s.
One for the older wide throw forged crank and one for the last /6's, narrow throw cast cranks? |
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| Author: | slantzilla [ Wed Mar 15, 2006 4:19 am ] |
| Post subject: | |
On a stock deck block with the 2.2 KB turbo pistons deck height will be -.020"/-.030". Mine came out to -.028" on 2 different blocks. Make sure you check your deck height on all cylinders too. I have heard of blocks that had different heights from front to back. You can also order race rings for the 2.2 pistons and only get 6 sets, but it costs just as much as buying 2 stock 4 piston sets, and you don't have 2 ring sets for spares.
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| Author: | featherduster76 [ Wed Mar 15, 2006 1:09 pm ] |
| Post subject: | |
Thanks guys. This helps me get in the ballpark..... SZ or DI : Do you recall which keith black pistons are in your engines?? KB239 or KB268??? Another Question also : What oversize on the 2.2 pistons and how much did you have the engines bored?? |
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| Author: | slantzilla [ Wed Mar 15, 2006 8:58 pm ] |
| Post subject: | |
I don't remember the number, but mine are .5mm oversize. It requires a +.065" overbore.
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| Author: | Doctor Dodge [ Thu Mar 16, 2006 6:34 am ] |
| Post subject: | |
Quote: Thanks guys. This helps me get in the ballpark.....
I have used the 2.2 Std., .5, .75 and 1mm O/S pistons over the years. (3.445, 3.465, 3.475, 3.485) SZ or DI : Do you recall which keith black pistons are in your engines?? KB239 or KB268??? Another Question also : What oversize on the 2.2 pistons and how much did you have the engines bored?? It boils down to that old "thicker cylinder wall vs more displacement" debate , you have to decide which will give you more power,... your choice. I always buy 2 sets of 4 ring packs, costs the same as getting 6 and I will only have to buy on set of 4 later, when I go to "freashen-up" the motor. DD |
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| Author: | featherduster76 [ Sat Mar 18, 2006 6:55 pm ] |
| Post subject: | |
Input on KB239's or 268's?? anyone?? |
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| Author: | DusterIdiot [ Sat Mar 18, 2006 7:41 pm ] |
| Post subject: | Sorry can't comment on that... |
Since my Silvolite 1291's are t the machinists in line to be dished I can't comment on the KB series of pistons for you. My block is 3.445 for std size 2.2L. This motor will be going into the FDX project. -D.Idiot |
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| Author: | featherduster76 [ Sun Mar 19, 2006 10:27 am ] |
| Post subject: | |
Thanks DI: Scored the whole 198 for $50
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| Author: | slantzilla [ Sun Mar 19, 2006 3:45 pm ] |
| Post subject: | |
Quote: Thanks DI: Scored the whole 198 for $50
Ya done good.  Block and heads are the same as 225, so you got lots of good parts.
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| Author: | featherduster76 [ Sat Apr 01, 2006 5:23 am ] |
| Post subject: | What bolts?? |
SlantZilla: What bolts are in your 198 rods?? Can I use arp rod bolts from the la series small blocks 273-360???same thing??? |
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| Author: | Doc [ Sat Apr 01, 2006 9:01 am ] |
| Post subject: | |
Use the ARP con rod bolts listed for the SL6, there are 2 types available. DD http://www.slantsix.org/articles/ARP-st ... rdware.htm |
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