GMPP Ram Jet 502 vs Merc HP500/525 EFI
#11
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#12
VIP Member
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The link shows the specs of cam and PN
http://www.gmperformanceparts.com/En...9121&engCat=bb
http://www.gmperformanceparts.com/En...9121&engCat=bb
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Patrick
Patrick
#13
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500efi
Crane HR-292-2S-14 IG
292*/298* @ .004"
230*/236* @ .050"
.598"/.610"
109* ICL
119* ECL
114* LSA
ZZ502 / Ram Jet GM#12366543
224*,234* at .050"
.527", .544"
110 LSA
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Also.....
Merc Blue has adj roller rockers / cast iron rect port 119cc chamber heads / crane hyd roller lifters
GM ZZ502/Ram Jet has stamped steel rockers/aluminum GMPP ovalport heads with 110cc
More differences but that's the basics.
===================
LSA is not everything when considering a cam for EFI. It's more overlap in consideration with intake vacuum levels. Taking the same cam in same motor but just changing LSA will effect overlap and thus intake vacuum levels. Major components like intake manifold design can also greatly influence intake vacuum levels. LSA is just measurement between intake centerline and exhaust centerline.
Crane HR-292-2S-14 IG
292*/298* @ .004"
230*/236* @ .050"
.598"/.610"
109* ICL
119* ECL
114* LSA
ZZ502 / Ram Jet GM#12366543
224*,234* at .050"
.527", .544"
110 LSA
=============================
Also.....
Merc Blue has adj roller rockers / cast iron rect port 119cc chamber heads / crane hyd roller lifters
GM ZZ502/Ram Jet has stamped steel rockers/aluminum GMPP ovalport heads with 110cc
More differences but that's the basics.
===================
LSA is not everything when considering a cam for EFI. It's more overlap in consideration with intake vacuum levels. Taking the same cam in same motor but just changing LSA will effect overlap and thus intake vacuum levels. Major components like intake manifold design can also greatly influence intake vacuum levels. LSA is just measurement between intake centerline and exhaust centerline.
#14
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#15
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http://www.gmperformanceparts.com/En...9121&engCat=bb
Other than some obvious issues with marinizing the crate Ram Jet, just how far apart is this motor from a Merc blue motor? Is a "GM" MEFI 4 easier to get access to than a "Merc" MEFI 4, for custom programming? Is the Merc HP EFI intake a GM part?
Other than some obvious issues with marinizing the crate Ram Jet, just how far apart is this motor from a Merc blue motor? Is a "GM" MEFI 4 easier to get access to than a "Merc" MEFI 4, for custom programming? Is the Merc HP EFI intake a GM part?
#19
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