<VV> Cylinder assemblies vs Pistons/rings + rebore

[Mark Durham]

Bob, I might have a different opinion if I was in the racing game
where better materials really shine, but for every day use where I am
going to put maybe 3000 miles a year on the car, the Grants will do
just fine. Just like the cast rings I used in my original Corvair back
in the 60's and 70's easily went 90-100K miles and I didn't baby the
car, either, I was a teen and college student that started the car at
-20F and drove away, and drove in the high temps in the summer too,
yet your severe service really eats them up.

The reason I brought up the Aircraft part is that those engines run at
full power on takeoff, and then run at 75% to 80% power while flying,
far more stress than what a automobile engine ever is put through,
accept for your racing engines. How do the cylinder bores hold up?
With the rings going bye bye so fast?

Regards Mark Durham

On Fri, Feb 11, 2011 at 8:19 AM,  <moonpie8n at comcast.net> wrote:
>   WELL,  Mark..........
>
>
>
>                 I  guess  that's  why  they  make  Chocolate , and  Vanilla
> ice  cream .............
>
>        Bob
>
> Moonpie  Racing
>
> ----- Original Message -----
> From: "Mark Durham" <62vair at gmail.com>
> To: cityhawk at pobox.com
> Cc: virtualvairs at corvair.org
> Sent: Friday, February 11, 2011 10:48:18 AM
> Subject: Re: <VV> Cylinder assemblies vs Pistons/rings + rebore
>
> Karl, the cost to have a set of cylinders bored oversize is about the
> same as the cost to get them already bored exchange from Clarks or
> larry's shop. Since you are on the east coast, the cost to ship from
> Larry's shop in CA would outbalance the cost to bore, or get a set
> exchange from Clarks.
>
> I doubt that Grant Rings are junk. Check out their web site. They are
> in many (1000's) OEM applications and they make a set of chrome rings
> for the Corvair. I just installed a set in the engine I am prepping to
> go back into the car in a week or so. I've overhauled engines since
> 1967 and the Grant rings look the same quality as Hastings, total
> Seal, or any other brand, in fact, they looked identical. I've also
> overhauled many air cooled aircraft engines and the rings used in
> those high temp engines also looked the same as Grants.
>
> I did a lot of comparison shopping between Clarks and Larry's shop.
> Larry's shop was cheaper for the same products, like Clevite bearings,
> total seal lifters, Isky 270 Cam, and since I am on the west coast, I
> decided to use Larry's shop for most everything because of shipping.
> But, you are in the same state as Clarks. If I was in Boston, I would
> use Clarks.
>
> If you want to save a few pennies, Clarks also has some $ saver cyls,
> ones they have shaved .010 off the top to clean up the gasket surface,
> also available in kits. The shave off will slightly increase
> compression which will also slightly increase HP and gas mileage.
>
> If you have any further questions, drop me a note. Mark Durham
>
>
>
> On Thu, Feb 10, 2011 at 11:58 AM, Karl Haakonsen <cityhawk at pobox.com> wrote:
>> Perhaps this question is premature, since I haven't yet had the chance
>> to take my engine apart (I need to use my limited Corvair time to repair
>> my snowblower since we're having a ridiculous amount of snow in Boston
>> this winter).... but does anyone on the list have insight as to the
>> wisdom of buying new piston/cylinder assemblies from Clark's vs just
>> getting oversized pistons/rings and having my existing cylinders
>> rebored? It seems as though the difference in price for the parts is a
>> few hundred dollars, but how much does reboring cost?
>>
>> Also, what of the "full fin" cylinders available from Clark's? Any
>> thoughts?
>>
>> Thanks!
>> Karl in buried Boston
>> www.chezhawk.com/VairBlog
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