6-71s/8-71s with EFI
#4
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My dad runs a BDS 871 with a ederlie birdcatcher on alky: 383 small block
What kind of problem are you having? Blown motors is all my dad has ever messed with i could ask him about your problem to see if he has any input.
What kind of problem are you having? Blown motors is all my dad has ever messed with i could ask him about your problem to see if he has any input.
#5
Originally Posted by TransSlam
My dad runs a BDS 871 with a ederlie birdcatcher on alky: 383 small block
What kind of problem are you having? Blown motors is all my dad has ever messed with i could ask him about your problem to see if he has any input.
What kind of problem are you having? Blown motors is all my dad has ever messed with i could ask him about your problem to see if he has any input.
The second one is a 6-71 on a 427 ford side oiler. This one will get the header tubes glowing. No matter what the timing, or A/F ratio. I think I know whats up with that one too. The header tubes are too small, I think.
Both are EFI motors, both pump gas.
Have more specifics, may be able to post pix.
TIA
#7
thats more along the lines of TBI. as for glowing the exhaust runners...it could be the cam. alot of duration may lead to the blower pushing fuel right into the exhaust before the exhaust valve completely closes.
i am curious to hear about these heat problems as i was about to do a 6-71 in my RX7 in a month or two
i am curious to hear about these heat problems as i was about to do a 6-71 in my RX7 in a month or two
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#8
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Originally Posted by Sneakin Deacon
thats more along the lines of TBI. as for glowing the exhaust runners...it could be the cam. alot of duration may lead to the blower pushing fuel right into the exhaust before the exhaust valve completely closes.
i am curious to hear about these heat problems as i was about to do a 6-71 in my RX7 in a month or two
i am curious to hear about these heat problems as i was about to do a 6-71 in my RX7 in a month or two
#9
Originally Posted by Sneakin Deacon
thats more along the lines of TBI. as for glowing the exhaust runners...it could be the cam. alot of duration may lead to the blower pushing fuel right into the exhaust before the exhaust valve completely closes.
i am curious to hear about these heat problems as i was about to do a 6-71 in my RX7 in a month or two
i am curious to hear about these heat problems as i was about to do a 6-71 in my RX7 in a month or two
#10
Both are batch fire, bank to kank, whatever you want to call them, so yes they are similar to TBI in that sense. Or TPI, as they too were bank to bank.
here's a link to the same thread in forced induction. Should help from answering, or asking questions twice.
https://ls1tech.com/forums/forced-induction/639788-6-71s-8-71s-efi.html
here's a link to the same thread in forced induction. Should help from answering, or asking questions twice.
https://ls1tech.com/forums/forced-induction/639788-6-71s-8-71s-efi.html
#11
Originally Posted by Wnts2Go10O
are you sure the valves are closing right? i would pressure test the vale springs before dropping money on another cam.
The heads, and obviously the valve springs are brand new, almost, just a lil run time. I know, I know, new dont mean good.
We're gonna try reducing the blower drive. its 9 % over right now. We're gonna swap the pulleys tuesday, retune and see what happens.
#12
Originally Posted by Sneakin Deacon
thats more along the lines of TBI. as for glowing the exhaust runners...it could be the cam. alot of duration may lead to the blower pushing fuel right into the exhaust before the exhaust valve completely closes.
i am curious to hear about these heat problems as i was about to do a 6-71 in my RX7 in a month or two
i am curious to hear about these heat problems as i was about to do a 6-71 in my RX7 in a month or two
We dont have all the build specs right this second.
We do know it was built as a blower motor, that is, low comp, mild "blower friendly" cam. It sure doesnt sound like its too radical. Dont really chop at all.