3.4PR H-272 cam parts list HELP (Page 1/2)
bergingstrucker OCT 23, 04:57 AM
I'm into a 3.4pr swap and busy ordering parts for this swap. Because I live in Europe and have to pay alot for shipping out of USA, I don't wanna miss parts on my order list. This is my parts list so far, please inform me if I order wrong parts or missing something.
I want to do this without having to machine the heads for spring clearance.

Cam: H-272 253941 (Crane)
Valve springs: 99848-12 (Crane)
Lifters: 99286-12 (Crane)
Retainer: 99915-12 (Crane)
Valve Stems locks: 99041-1 (Crane)
Pushrods/Rockers: RP1413-12 (Comp Cams)
17lbs. injectors 0280150415/13641730060 (BMW)
PhatMax OCT 23, 08:04 AM
How about cam bearings and timing chain/gear set. Complete gasket set. ?
olejoedad OCT 23, 08:10 AM
Why not Crane pushrods and rockers?
Its usually best to use all of your valvetrain components from the same manufacturer.
Do the BMW injectors have the same impedance and resistance as the GM 17# injectors?

[This message has been edited by olejoedad (edited 10-23-2019).]

bergingstrucker OCT 23, 08:36 AM
see below

[This message has been edited by bergingstrucker (edited 10-23-2019).]

bergingstrucker OCT 23, 08:38 AM

quote
Originally posted by PhatMax:

How about cam bearings and timing chain/gear set. Complete gasket set. ?



Gasket set and timing chain/gear set do I have already. Do I have to change the cam bearings when I change cam?

bergingstrucker OCT 23, 08:39 AM

quote
Originally posted by olejoedad:

Why not Crane pushrods and rockers?
Its usually best to use all of your valvetrain components from the same manufacturer.
Do the BMW injectors have the same impedance and resistance as the GM 17# injectors?




BMW injectors are even better I've read on this forum. Otherwise I'll take the 17 lbs which were with the 3.4
I've been looking for Crane rockers and pushrods but couldn't find them:-(
fierofool OCT 23, 09:04 AM
Olejoedad and Bergingstrucker, those BMW injectors are rated at 17#, are the correct impedence, and operate efficiently on the Fiero ECM. Though some have used them successfully, the original 3.4 Rochester injectors tend to give problems.

However, with the mods being done to the engine, the injectors may not be sufficient and could cause the engine to run lean. Their max flow at 80% duty cycle is 16.76 lb/hr.

Go to Injector Planet and look at their injector calculator app. You will need to have a base idea of how many HP your modified engine will produce. If you are producing 180 HP, you would need 19 lb/hr injectors such as the Mustang 302 injectors.

These are 4-pintle design injectors.
Bosch EV1 Fuel Injector
Jetronic port / 4 hole nozzle

Flow rates @ 43.5 psi / 3 bar
16.76 lb per hour (My Note: 17# rated injectors flow at approximately 16.666 lb/hr at 3 bar or 43.5 psi. See calculator chart below)
126.5 G per min. (N-Heptane)
176.1 cc per min

15.90 Ohm resistance

[This message has been edited by fierofool (edited 10-23-2019).]

Blacktree OCT 23, 01:00 PM
With that setup, you might need 19# injectors. If you have the ability to tune the ECM, then I would suggest getting 19# injectors, and adjust the fueling to accommodate them.
olejoedad OCT 23, 02:46 PM
Have you contacted Crane directly?
Raydar OCT 23, 05:32 PM
I had a 3.4 with that cam. I used the Comp 1.52 roller tip rockers. I think there were some Cranes available, but they were full roller, instead of roller tip, and were wildly expensive. A bunch of money for very little gain, IMHO.
I had 19# injectors in mine, but I also had a bunch of head and manifold work done, and a set of tuned headers. The 19s should run well in yours, with some minor tweaks to the tune. (On a stock chip, they'll run a little rich, especially when the engine is cold. But not badly.)

[This message has been edited by Raydar (edited 10-23-2019).]