Honda Insight Forum banner

Ulev 5spd vs Sulev CVT.

2417 Views 9 Replies 6 Participants Last post by  BLUEBUG
Ok this is maybe a stupid question but I am going for it:

Why is there an emissions level difference between a CVT and a 5 spd ?
Does the CVT has leanburn or not ?
What is the exact difference between the 2 engines without
the cvt or 5 spd gearboxes. I don't have a clue.
I know that leanburn exhaust gasses are more "dirty" compared to non-leanburners due to the fact that the combustion is not optimal compared to non leanburners.
In this http://www.insightcentral.net/KB/faq-cvt.html#Chart part I see that the engine compression ratios are 10.8 to 1 (5spd) and 10.3 to 1 (CVT). I tought that for a leanburn engine, the ratio is about 22 to 1.
So as I have to say: What is it ?
1 - 4 of 4 Posts

· Registered
Joined
·
282 Posts
Discussion Starter · #4 ·
Is it not so that lean burn ratio is about 22 to 1 ? So 10.8 to 1 is normal " burn" .
In Europe we do only have the 5 spd ---->lean burn. In the Uk I think it is the same.
So actually the CVT is a non-vtec-e, because leanburn (5spd) requires a vtec-e. This must be difference is it ?
 

· Registered
Joined
·
282 Posts
Discussion Starter · #6 ·
Yes hawkGT647, I mixed it up ! Now I understand, sorry.
I didn't know that air to fuel ratio will vary from 14.7:1 all the way to 25:1.
I tought it was a fixed ratio. And yes lean burners are more poluting.
The only question that will remain is why does Honda made the CVT's non lean burn ? Both engines output performance are almost the same, even the high Californian emission standards are ok for the lean-burners so why Honda didn't ?. Is the CVT so much more "work" for the Insight's little engine ?
Mmmm I am gonna take a look in the maintenance manual or I can Find something difference in the engine's head.
 
1 - 4 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top