RWD Double Roller Timing Chain?

[caffeine]

I've been wondering why you don't see the Cloyes DRTC being used at all in the FWD engines. Is the crank gear incompatible?

I found this thread: http://www.thirdgen.org/techboard/v6....html?styleid= on TGO where a roller cam is installed in place of a flat tappet cam with the Cloyes DRTC.

Another question I have; if the RWD crank sprockets fit on the FWD crank just fine, is it possible to get a roller cam made that will bolt to a RWD cam gear with no mods?

[caffeine]

Another thought I've had is using the 3900 timing chain tensioner with the skinny 3500 timing chain. The chain itself is the same part # between the two and it seems to me that using a tensioner could prolong the chains lifespan. Any thoughts on this? After taking the cam out of the 3500 in my Firebird with 15,000kms on 26986 springs, there wasn't any really excessive slack, although there was more than what I started wirh

[SappySE107]

3 bolt vs single bolt cams so the cam gear is not compatible.

[caffeine]

If you read the thread on TGO it looks like the poster drilled/tapped the three holes into the roller cam so that he could use the RWD gear. Is there any reason the roller cams can't be made already with a 3-bolt flange?

[ericjon262]

If you read the thread on TGO it looks like the poster drilled/tapped the three holes into the roller cam so that he could use the RWD gear. Is there any reason the roller cams can't be made already with a 3-bolt flange?

I've been wondering about this myself, I've seen multiple threads now where the pin on the cam has sheared, and it makes me apprehensive about the single bolt and pin setup the roller cams used.

[caffeine]

Realistically I think you're overthinking this; if you properly torque the cam gear bolt you shouldn't encounter any shearing. That being said if a 3 bolt flange were available it would have the benefit of eliminating the possibility of shearing the dowel in addition to being compatible with the Cloyes DRTC.

[ericjon262]

I've seen more then one failure, so to me, three bolts, plus a shear pin is nice cheap insurance. did the build you saw use a FWD timing cover?

[caffeine]

RWD Double Roller Timing Chain?

No it used a RWD cover. Check out the link above... However Gen IIs used a 3-bolt cam gear and FWD cover so a 3-bolt gear will fit... the question is whether or not the Cloyes DRTC will fit

[ericjon262]

No it used a RWD cover. Check out the link above... However Gen IIs used a 3-bolt cam gear and FWD cover so a 3-bolt gear will fit... the question is whether or not the Cloyes DRTC will fit

mybad, missed the link.

[Guest]

is the cam guide pin for the chain sprocket in the same location for flat tappet and roller cam in the same location relative to the number 1 lobe? if so then that means the timing mark on the Double roller would be in the same spot. I haven't read through the whole thread yet, but it does look like there are pics but can't view since not a member

[1988GTU]

can't view since not a member

x2

Can someone rehost the pics here??

[3400-95-Modified]

I have the Cloyes DRTC at home since I have a MPFI engine I was going to test it on... I have a feeling that not only is it specific to the flat tappet cam due to the bolt design obviously, BUT I believe it also sticks out further from the block and will not fit behind a FWD timing cover but I don't know that for sure.

[Guest]

i have seen pics where people have filed/machined/carved grooves onto the inside of a fwd timing cover to clear a double roller. not sure if it was a gen 2 motor, or one of those custom double rollers made for the gen 3 on here.

my question is why does the 3500 crank have to be machined for a tce double roller? is it to help bring the chain in closer to clear the timing cover or because the cam and crank gear would be out of alignment?

[pocket-rocket]

I believe it's to give enough clearance for the chain to wrap the crank gear without binding/hitting the crank on the connecting rod side of the gear. Maybe the links are bigger on the DRTC than the stock.

Sent from my HTC One X using Tapatalk

[3400-95-Modified]

I believe its because the chain is closer so therefore if the crank isn't clearanced enough to allow the chain to fit...