# Difference Between 1991-1994 KA24DE and 1995-1998 KA24DE? **URL:** \ **Category:** SON240sx Automotive\ **Created:** [October 9, 2010, 7:22am UTC](https://forums.speedlife.net/t/difference-between-1991-1994-ka24de-and-1995-1998-ka24de/161315 "2010-10-09T07:22:28Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Nismo240SX](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nismo240sx/32/5755_2.png) [@Nismo240SX](https://forums.speedlife.net/u/Nismo240SX)\ **Post date:** [October 9, 2010, 7:22am UTC](https://forums.speedlife.net/t/difference-between-1991-1994-ka24de-and-1995-1998-ka24de/161315/1 "2010-10-09T07:22:28Z")
I am ordering internals for a KA24DE. Its a mysterious motor that i bought thats in really good shape. But i dont know what year it was out of. I was looking at Part sites to buy pistons and rods, and theres KA24DE from 1991-1994 years and KA24DE from 1995-1998 years. What is the difference? Piston ratios? Will this make a difference when buying parts? Please let me know. Correct me if i’m wrong. Thanks ---
**Author:** ![Nismo240SX](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nismo240sx/32/5755_2.png) [@Nismo240SX](https://forums.speedlife.net/u/Nismo240SX)\ **Post date:** [October 9, 2010, 3:49pm UTC](https://forums.speedlife.net/t/difference-between-1991-1994-ka24de-and-1995-1998-ka24de/161315/2 "2010-10-09T15:49:57Z")
If know one thinks theres a difference then that helps too haha ---
**Author:** ![BCHLR240SX](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bchlr240sx/32/5754_2.png) [@BCHLR240SX](https://forums.speedlife.net/u/BCHLR240SX)\ **Post date:** [October 9, 2010, 6:20pm UTC](https://forums.speedlife.net/t/difference-between-1991-1994-ka24de-and-1995-1998-ka24de/161315/3 "2010-10-09T18:20:36Z")
I don’t think there’s a difference. ---
**Author:** ![Lucas180](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/lucas180/32/5556_2.png) [@Lucas180](https://forums.speedlife.net/u/Lucas180)\ **Post date:** [October 9, 2010, 7:10pm UTC](https://forums.speedlife.net/t/difference-between-1991-1994-ka24de-and-1995-1998-ka24de/161315/4 "2010-10-09T19:10:40Z")
no difference ---
**Author:** ![Nismo240SX](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/nismo240sx/32/5755_2.png) [@Nismo240SX](https://forums.speedlife.net/u/Nismo240SX)\ **Post date:** [October 9, 2010, 8:48pm UTC](https://forums.speedlife.net/t/difference-between-1991-1994-ka24de-and-1995-1998-ka24de/161315/5 "2010-10-09T20:48:49Z")
thanks guys ---
**Author:** ![Clutchfire](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/clutchfire/32/5654_2.png) [@Clutchfire](https://forums.speedlife.net/u/Clutchfire)\ **Post date:** [November 1, 2010, 9:25am UTC](https://forums.speedlife.net/t/difference-between-1991-1994-ka24de-and-1995-1998-ka24de/161315/6 "2010-11-01T09:25:25Z")
Yeah I heard there is a difference. One is OBD I compliant and the other is OBD II compliant. that means different emissions. I hear that also means different ECU different MAF different plugs. It is not plug and play. However the block is the same. so yeah swap over your S13 parts and I am not sure but heard the spark plug timing is done differently then the S13. hence the new ECU. ---
**Author:** ![Neon\_Rain519](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/neon_rain519/32/5671_2.png) [@Neon\_Rain519](https://forums.speedlife.net/u/Neon_Rain519)\ **Post date:** [November 1, 2010, 10:41am UTC](https://forums.speedlife.net/t/difference-between-1991-1994-ka24de-and-1995-1998-ka24de/161315/7 "2010-11-01T10:41:51Z")
I think the compression is higher on the 95-98, I can’t remember thought. I thinks it 91-94 8.9:1 and the 95-98 is 9.5:1. But It won’t make a difference in the parts.