|
07-08-2019, 12:42 AM | #21 |
VIP Member
Join Date: Oct 2008
Posts: 2,116
Likes: 1,078
Liked 181 Times in 111 Posts
|
Re: Offset grinding crank ?
The impact is a bit more compression from the added stroke.
Draws .013 more air and then compresses .013 a differential of .026 Plus slightly smaller diameter crank diameter, less parasitic drag. Most engines it is about 1.5 cuin increase. Last edited by Dan Fahey; 07-08-2019 at 12:45 AM. |
07-08-2019, 06:40 AM | #22 |
Live Reporter
Join Date: Oct 2004
Location: Hickory, Ky
Posts: 10,447
Likes: 1,746
Liked 10,054 Times in 2,087 Posts
|
Re: Offset grinding crank ?
...
|
07-08-2019, 06:59 AM | #23 |
VIP Member
Join Date: Dec 2001
Location: Arkansas - In the middle of everything.
Posts: 1,986
Likes: 55
Liked 731 Times in 180 Posts
|
Re: Offset grinding crank ?
Excuse me!?! Stroke is measured from BDC to TDC so the "differential" is .013", not .026".
__________________
|
Liked |
07-08-2019, 11:11 AM | #24 |
VIP Member
Join Date: Apr 2003
Location: Tulsa, Oklahoma
Posts: 1,610
Likes: 3,492
Liked 704 Times in 305 Posts
|
Re: Offset grinding crank ?
|
07-08-2019, 12:42 PM | #25 |
Member
Join Date: Aug 2010
Location: CT
Posts: 426
Likes: 1,402
Liked 319 Times in 134 Posts
|
Re: Offset grinding crank ?
No, no more than spec. You just don't have to deck the block as much.
__________________
Phil Molski PMR Performance S/C 1623 |
Liked |
07-08-2019, 05:00 PM | #26 |
VIP Member
Join Date: Dec 2001
Location: Arkansas - In the middle of everything.
Posts: 1,986
Likes: 55
Liked 731 Times in 180 Posts
|
Re: Offset grinding crank ?
Yes. And max compression is dictated by spec limits. Adding stroke does not increase compression except for the additional displacement added to the mix.
__________________
|
Liked |
07-08-2019, 05:13 PM | #27 | |
Veteran Member
Join Date: Mar 2002
Location: Miles From Nowhere
Posts: 7,635
Likes: 2,747
Liked 4,805 Times in 1,828 Posts
|
Re: Offset grinding crank ?
Quote:
To me, the indexing and smaller pin size are at least equal in value. BTW, thank you to to Dwight for what you do for racers....Appreciated by 98% of them ,and called names by those who are Left.
__________________
Real life never quite adds up.... Jay Farrar |
|
Liked |
07-09-2019, 08:40 AM | #28 |
Live Reporter
Join Date: Oct 2004
Location: Hickory, Ky
Posts: 10,447
Likes: 1,746
Liked 10,054 Times in 2,087 Posts
|
Re: Offset grinding crank ?
Gasket thickness (A) and deck (B) can vary, but total of A+B has to same as or greater than NHRA spec. .000 deck and .040 gasket = -005 deck and .035 gasket or +005 deck and.045 gasket. Give yourself a few extra thousandth to the good side so you can be fearless in tear down.
|
|
|