Rank: Member
Groups: Registered
Joined: 20/02/2006(UTC)
Posts: 990
|
just reading an old post by byron, what would the compression ratio be if i put 202 4cc dish pistons in? i don't know how to calculate the compression ratio if the pistons are sitting 1/8th down the bore at TDC any ideas?
If it doesn’t burn fossil fuels, it’s not a sport.
|
|
|
|
|
|
Rank: Veteran
Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,902
Thanks: 1 times
Was thanked: 559 time(s) in 534 post(s)
|
If you are trying to lower the compression ratio of a 186 by using 202 pistons eg for turbo/blower application I imagine you'd want flat or dome top 202 pistons (if dome top actually exist?) and a 161/173 head. At a guess this would probably equate to abo |
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords? |
|
|
|
|
|
Rank: Veteran
Groups: Moderator, Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 14,902
Thanks: 1 times
Was thanked: 559 time(s) in 534 post(s)
|
If you are trying to lower the compression ratio of a 186 by using 202 pistons eg for turbo/blower application I imagine youd want flat or dome top 202 pistons (if dome top actually exist?) and a 161/173 head. At a guess this would probably equate to abou |
_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords? |
|
|
|
|
|
Rank: Member
Groups: Registered
Joined: 28/03/2006(UTC)
Posts: 810
Thanks: 1 times
Was thanked: 1 time(s) in 1 post(s)
|
The comp ratio is the swept voulme (bore x stroke) divided by the total combustion chamber volume.
ie: Bore x Stroke
-----------------------------------------------------
Bore Volume Above Piston + Piston Dish + Head Cha |
You only have to be in front at the end of the race. |
|
|
|
|
|
Rank: Member
Groups: Registered
Joined: 28/03/2006(UTC)
Posts: 810
Thanks: 1 times
Was thanked: 1 time(s) in 1 post(s)
|
quote:
Originally posted by Byron Rich
or dome top 202 pistons (if dome top actually exist?)
|
You only have to be in front at the end of the race. |
|
|
|
|
|
Rank: Member
Groups: Registered
Joined: 20/02/2006(UTC)
Posts: 990
|
pin height is the same. changed my mind. gonna use a 202 for the turbo idea.
If it doesn’t burn fossil fuels, it’s not a sport.
|
|
|
|
|
|
Rank: Veteran
Groups: Moderator, Registered
Joined: 1/03/2005(UTC)
Posts: 6,116
Thanks: 1 times
Was thanked: 219 time(s) in 199 post(s)
|
quote:
Originally posted by JBM
The comp ratio is the swept voulme (bore x stroke) divided by the total combustion chamber vol |
If at first you don't succeed, just call it Version 1.0 |
|
|
|
|
|
Rank: Veteran
Groups: Moderator, Registered, Veteran
Joined: 2/08/2006(UTC)
Posts: 1,307
|
Hey Doc, Terry
does this mean the air fuel is compressed to 1/8, of its original volume??
or 1/9,,etc etc? whatever the ratio is?
and if so, how does this relate to "bar", the term they use for air compressors, and their efficency??
cheers
ptpro
m |
more than basketcase than a bear!
DOH!!! |
|
|
|
|
|
Rank: Veteran
Groups: Moderator, Registered
Joined: 1/03/2005(UTC)
Posts: 6,116
Thanks: 1 times
Was thanked: 219 time(s) in 199 post(s)
|
quote:
Originally posted by fallingbear
Hey Doc, Terry
does this mean the air fuel is compressed to 1/8, of its original volu |
If at first you don't succeed, just call it Version 1.0 |
|
|
|
|
|
Rank: Veteran
Groups: Moderator, Registered, Veteran
Joined: 2/08/2006(UTC)
Posts: 1,307
|
Hey thanks doc.
another question>> a small model eg, aeroplane etc,,engine, can it still produce the same amount of compression?
and if so, would this mean if one had say ten 20cc engines, it would still equal the same as having 1 200cc engine, th |
more than basketcase than a bear!
DOH!!! |
|
|
|
|
|
Rank: Veteran
Groups: Moderator, Registered
Joined: 1/03/2005(UTC)
Posts: 6,116
Thanks: 1 times
Was thanked: 219 time(s) in 199 post(s)
|
Hi fb.
Youve asked 3 questions in one this time.
Yes, 10 x 20cc engines will have the same swept volume as 1 x 200cc engine. But compression figures will differ.
What many people confuse is the comparison between the compression ratio & cylinder |
If at first you don't succeed, just call it Version 1.0 |
|
|
|
|
|
Rank: Veteran
Groups: Moderator, Registered
Joined: 1/03/2005(UTC)
Posts: 6,116
Thanks: 1 times
Was thanked: 219 time(s) in 199 post(s)
|
Hi fb.
You've asked 3 questions in one this time.
Yes, 10 x 20cc engines will have the same swept volume as 1 x 200cc engine. But compression figures will differ.
What many people confuse is the comparison between the compression ratio & cylinder |
If at first you don't succeed, just call it Version 1.0 |
|
|
|
|
|
Rank: Veteran
Groups: Moderator, Registered, Veteran
Joined: 2/08/2006(UTC)
Posts: 1,307
|
thanks doc!!!
i will have to think about it all for only a little while, to figure it out?? 2>3 weeks!!! but it is very helpful?
cheers
ptpro
madmax transit, 308t400 campervan |
more than basketcase than a bear!
DOH!!! |
|
|
|
|
|
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.
