are the 5g usdm base lude cams higher then the 4g SIR jdm ludes?
and what about the 4g usdm cams compared to the jdm ones?

 

4th Gen JDM have a slightly more aggressive profile. 5G jdm and 5G usdm are slightly different as well. If you were going to replace your cams, I would use JDM 5G cams.

 

Do you have any proof? I've always heard they are exactly the same....except for the type s obviously.

 

i doubt anyone has actual proof, but the jdm engine does put out 10hp more at the fly.....the cams are probably different....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">i doubt anyone has actual proof, but the jdm engine does put out 10hp more at the fly.....the cams are probably different....</TD></TR></TABLE>

*shrug* maybe someone has actually measured the USDM and JDM cams (exl. Type-S), but one could probably explain away the 10hp difference with the increased CR (10:1 to 10.6:1)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">i doubt anyone has actual proof, but the jdm engine does put out 10hp more at the fly.....the cams are probably different....</TD></TR></TABLE>

Ummm...no...like Featherfire said, the difference is in the compression ratio.

 

well Ill look around for the lift specs sometime, ive seen them before but cant remember where atm..

Also, the 10hp difference is mostly from the compression ratio and the tune of the ECU..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ludeDVR &raquo;</TD></TR><TR><TD CLASS="quote">Ummm...no...like Featherfire said, the difference is in the compression ratio.</TD></TR></TABLE>

ummmm.....no.....like i said, its in the cams also....

.6 in compression does not pick up 10 hp....

bigger cams and higher compression work together for more hp, one or the other would pick up hp, but honda would never do just half of the work, they would redo the whole thing to make them suit each other....

 

well the measurements i made with my stack of stock cams from usdm and jdm engines they all were the same sized lobes.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Pdu-Nz &raquo;</TD></TR><TR><TD CLASS="quote">well Ill look around for the lift specs sometime, ive seen them before but cant remember where atm..

Also, the 10hp difference is mostly from the compression ratio and the tune of the ECU..</TD></TR></TABLE>

This guy had it right, the compression ratio and the tune of the ECU (Because they have higher octane gas in JDM land so it can be tuned more aggressively)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 97Preludeguy &raquo;</TD></TR><TR><TD CLASS="quote">

This guy had it right, the compression ratio and the tune of the ECU (Because they have higher octane gas in JDM land so it can be tuned more aggressively)
</TD></TR></TABLE>

but like mgags7 said the cams are slightly more aggressive. they wouldnt just bump the compression. if you see now a days with the newer honda motors when they get bumped 10hp or so they slightly bump compression and the cam profile and of course remap the ecu's to compensate

 

if they are more aggressive it is not by lift as i measured, but possibly by duration since i cnat measure that with calipers very easily or accurately.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v4lu3s &raquo;</TD></TR><TR><TD CLASS="quote">if they are more aggressive it is not by lift as i measured, but possibly by duration since i cnat measure that with calipers very easily or accurately.</TD></TR></TABLE>

possibly.

 

The JDM cams produce a lil bit more power in the powerband then the USDM. Just a few more hundred and still make power in the power band