| Page: |
| Home > Technical Chat > Decked blocks | |||||||
|
313 Posts Member #: 9367 Senior Member Derby |
7th Dec, 2012 at 10:01:40pm
I'm just wondering if anyone could help out working out whether my block that is decked to 21253 pistons would work with omegas forged 18cc pistons or if they would sit too high. Ideally I don't want to have to get a new block but if it doesn't work I'll have to.
|
||||||
 690 Posts Member #: 1851 Post Whore Woolavington, Zummerzet |
7th Dec, 2012 at 10:09:02pm
21253s are hugely tall - I had to have .045" lopped off the top of mine !
Metric is for people who can't do fractions. |
||||||
|
313 Posts Member #: 9367 Senior Member Derby |
7th Dec, 2012 at 10:24:43pm
Did you fit the omegas then? |
||||||
 11046 Posts Member #: 965 Post Whore Preston On The Brook |
7th Dec, 2012 at 10:27:57pm
Most aftermarket pistons I have installed sit between 0.060" and 0.040" down the bore on a standard height block, those include 21253's, Minispares Mega's, Accralite forged and Oldschool Omega's On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
||||||
 16540 Posts Member #: 4241 King Gaycharger, butt plug dealer, Sheldon Cooper and a BAC but generally a niceish fella if you dont mind a northerner Rotherham, South Yorkshire |
8th Dec, 2012 at 09:12:59am
My 0.020" cast omegas where 0.040" down the bore. I had 0.030" taken of my block to get the CR sensible. On 11th Feb, 2015 robert said:
i tried putting soap on it , and heating it to brown , then slathered my new lube on it 
|
||||||
 7765 Posts Member #: 74 I pick holes in everything.. Chief ancient post excavator |
8th Dec, 2012 at 10:20:24am
I think the compression height on those two should be quite similar. You could have the pistons turned in a lathe though, if a problem. On 13th Jul, 2012 Ben H said:
Mine gets in the way a bit, but only when it is up. If it is down it does not cause a problem. |
||||||
 1492 Posts Member #: 9468 Post Whore Wootton Bassett |
8th Dec, 2012 at 03:21:30pm
why do the pistons sit so far down the block? On 10th Mar, 2012 theoneeyedlizard said:
Hypothetically speaking, where would you stick your nozzle? On 22nd Jun, 2012 apbellamy said:
my wife doesn't know what.head is never mind compression ratio. |
||||||
|
11046 Posts Member #: 965 Post Whore Preston On The Brook |
8th Dec, 2012 at 07:08:31pm
On 8th Dec, 2012 Craigie-B said:
why do the pistons sit so far down the block? It makes it easy for the amature engine builder to set the compression ratio to suit the cam with off the shelf parts. any decent engine builder would set the pistons flush with the top of the block and set the compression ratio to suit the cam by machining the head to suit. On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be... So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'... On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........ |
||||||
 9812 Posts Member #: 332 Resident Cylinder Head Modifier Mitsi Evo 7, 911, Cossie. & all the chavs ...... won no problem |
8th Dec, 2012 at 07:20:01pm
how much has come off the block to start with ?
|
||||||
|
313 Posts Member #: 9367 Senior Member Derby |
8th Dec, 2012 at 10:03:56pm
I don't know exactly how much has come off the block just that it is flush with the pistons. Which are 21253's. |
||||||
| Home > Technical Chat > Decked blocks | |||||||
|
|||||||
| Page: |