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Thread: Pinto engine and camshaft to choose

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    Pinto engine and camshaft to choose

    Hi! I m restoring my old Cortina and now I am going to rebuild my Pinto engine, specs so far are:
    V6 Pistons
    Head flowed with 45,5 inlet and 38,1 exhaust valves
    Kent FR 32 kit
    YB Cosworth rods
    high pressure oil pump
    4-2-1 exhaust manifold
    free flow exhaust
    Twin Weber DCOE 45s with 38mm chokes
    Fast Road vacuumless distributor
    T9 GearBox and 4,1 final gear

    I m thinking about to change FR32 camshaft with Kent GTS1 , has anyone ever tried it with similar engine spec?
    what power output should I expect?
    my rev limiter will be set at 7000 rpm
    does anyone has any Dynos chart of a pinto withGTS 1 camshaft?
    what is your opinion?
    Car is for road use and this is the reason that I am trying to choose a camshaft between FR32 and GTS1

    :-)

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    Re: Pinto engine and camshaft to choose

    140-150 bhp if theres nothing wrong with your fr32 just re use it i cant see a gts1 giving a lot more power

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    Re: Pinto engine and camshaft to choose

    You’d be better with an fr33 or RL31 I’d looking for improvement over your FR32

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    Re: Pinto engine and camshaft to choose

    I m planning to fit long inlet manifold (6”) for my DCOE s
    and long ram pipes to get as much torque as possible
    After some calculations I ve made
    my intakes total length is perfect for up to 7000 rpm

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    Re: Pinto engine and camshaft to choose

    I have found over the internet some Dynos charts from setup with FR32 and I want to see how GTS1 camshaft performs Over the rev range

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    Re: Pinto engine and camshaft to choose

    Quote Originally Posted by madmaxptt View Post
    I m planning to fit long inlet manifold (6”) for my DCOE s
    and long ram pipes to get as much torque as possible
    After some calculations I ve made
    my intakes total length is perfect for up to 7000 rpm
    I’d say it’s more how good your heads flows that will determine where it makes power

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    Re: Pinto engine and camshaft to choose

    Quote Originally Posted by madmaxptt View Post
    I have found over the internet some Dynos charts from setup with FR32 and I want to see how GTS1 camshaft performs Over the rev range
    You'll find the GTS1 is a copy of another Cam design by another company just like the GTS3 and 4 are.

    Cam manufacturers keep changing cams and adding to their catalogues not because the cams neccesarily give more power or torque but to ensure they keep selling different ones to us to save going out of buisness. There are only so many profiles for a Pinto engine and most are already tried and tested.

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    Re: Pinto engine and camshaft to choose

    Quote Originally Posted by madmaxptt View Post
    I have found over the internet some Dynos charts from setup with FR32 and I want to see how GTS1 camshaft performs Over the rev range
    Needles trying to compare dyno graphs, all heads will be different so is power output and head is more important as the cam.

    RL31 will be the fastest cam still giving torque and giving zero tuning problems. Can't say it is a "road cam" to me but always working. Piper BP 300 and Newman Ph 4,75 will do exact the same.

    38 choke will be to big for road engine. Specially for FR32

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    Re: Pinto engine and camshaft to choose

    So you believe that RL31 worth it and I will notice the difference in performance compared with Fr32
    About the rest of my engine's specs... is it going to work with RL31?

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    Re: Pinto engine and camshaft to choose

    Definitely provided you have enough compression

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    Re: Pinto engine and camshaft to choose

    Has anybody ever drive a car with RL31 at low rpm (<3000rpm)

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    Re: Pinto engine and camshaft to choose

    Yes. You can make them pull cleanly from around 2500 with some careful tuning, they are fairly civilised below that with a nice idle, if you have a good head and use 36mm chokes an RL is a good fast road cam, 38mm chokes for more top end. If you want something a bit milder then go for an Fr33, my old engine saw 162hp on an FR, just didn’t have a huge amount of top end.

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    Re: Pinto engine and camshaft to choose

    If you're v6 pistons aren't forged then you might want to think about some forged ones, depending on what cr you do end up with.
    My v6 pistons run 10:79.1 cr, but that's over the realms of safety really.

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    Re: Pinto engine and camshaft to choose

    I have 38mm chokes and 160mm inlet manifold with 150mm ram pipes
    I believe with this combination I will have top end power (up to 7200rpm max with rev limiter) and low rev pulling power because of air/mixture speed of this to long intake! (Thank God there is enough room in Cortina engine bay

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    Re: Pinto engine and camshaft to choose

    Your head is where the power is made or not. That’s where you need to focus with a Pinto, my inlet is shorter than that and I’m making max power 7700 - 8k

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    Re: Pinto engine and camshaft to choose

    I have calculated the total length of my intake and it can work well up to 7300 higher than 7300rpm it will need to be sorter to work properly

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    Re: Pinto engine and camshaft to choose

    Quote Originally Posted by madmaxptt View Post
    I have calculated the total length of my intake and it can work well up to 7300 higher than 7300rpm it will need to be sorter to work properly
    forget trying to calculate intake length, there are just too many variables, pintos like long, the longer the better

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    Re: Pinto engine and camshaft to choose



    Is this the length of inlet manifold you had in mind Madmax?

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    Re: Pinto engine and camshaft to choose

    Click image for larger version Name:	IM4260_Inlet_Manifold.jpg Views:	87 Size:	25.2 KB ID:	84442

    This is the inlet manifold (6,5"/160mm) but with long trompets 150mm

    Click image for larger version Name:	45-1501.jpg Views:	83 Size:	10.6 KB ID:	84443

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    Re: Pinto engine and camshaft to choose

    Jaysus they are long trumpets!

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    Re: Pinto engine and camshaft to choose

    Pretty sure I've got an old inlet manifold about that long tucked away in the garage somewhere. Never been any use to me, only ever having the Escort..

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    Re: Pinto engine and camshaft to choose

    its about having all parameters work. I have to figure out mine. But as for any engine, first is the cyl.head. where power is made.
    Choose a road cam with about lobe centers around 110-112 for good smooth idle running. Most cam manufactors do have them
    for road applications. Piper cams is good, Kent cams ok to. duration and camlift. Don't go overboard with this.
    Tuning inlet and exhaust is if done right not an easy job. Testing and more testing on rolling road gives answers.
    But if money is limited, go for so called fast road profile, and make the best out of it, again the cylinderhead is where it does the most.
    No use if you put in a agressive cam, with poor flow. 3 inch inlet mani with your 45 dcoe and i would start with 36 mm chokes.
    Tune with carb stacks not to short. Exhaust 4-2-1 is good gives more nice torque curve. But also here is tuning lenght and dia. of first, secondairy
    pipes important. However i know, it is for most of us beyond our budget to get it tested all together. If possible make the manifolds
    adjustable ( spacers for inlet ) ( sleeve on sections for exhaust ) for testing. Lot of work but can be done.
    Last edited by gid; 05-09-2019 at 19:32.

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    Re: Pinto engine and camshaft to choose

    If everything is going to work ok I will post my engines dyno chart
    I hope to get the following Results with this setup:
    170-180 Hp
    Great rpm range with a lot of torque (up to 220NM peak)

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    Re: Pinto engine and camshaft to choose

    Then you need an RL31 cam minimum, possibly something more, in my experience an RL31 with a good head and 38mm chokes gives approx 165-170hp. Your FR32 will see 150hp on a good day

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    Re: Pinto engine and camshaft to choose

    FR32 indeed would be to mild to get the output you want to see. RL31 or even stepping up to GP1 cam, but thats not just a swap of cams. Needs work
    I dont think you get 180 hp from a rev limit set to 7000. Above that i'm not sure the V6 pistons are a good choice.
    I'd go for torque, and 150-160 HP is a lot of go fast on road anyway.

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    Re: Pinto engine and camshaft to choose

    My primary target is torque that's why I m going to install this long inlet and these long trompets, If I see a good HP peak also it's OK
    I like torque more than bhp because car is much faster going from A to B point

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    Re: Pinto engine and camshaft to choose

    If you want torque go the other way FR30 cam, plenty of grunt from next to no all rpm!

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    Re: Pinto engine and camshaft to choose

    I already have an FR32 but it s like a limiter to my engine
    So I decided to install RL31 with these long trompets and long inlet so I will raise bhp and torque
    Fr30 is a very good camshaft for an engine with stock 32/36DGAV and max 6000-6300 rpm

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    Re: Pinto engine and camshaft to choose

    Madmax: then it would be ok, but the hp figures you were after is going a bit enthousiastic. That is what Erikmex said before. And then what i mentioned the ( standard? ) pistons of a V6
    how far they do endure the stresses applied. ( can not remember now the strenght of conrods of the OHC Pinto ) but the stock Pinto crank well balanced holds up to 8000 rpm.

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    Re: Pinto engine and camshaft to choose

    Madmax: then it would be ok, but the hp figures you were after is going a bit enthousiastic. That is what Erikmex said before. And then what i mentioned the ( standard? ) pistons of a V6
    how far they do endure the stresses applied. ( can not remember now the strenght of conrods of the OHC Pinto ) but the stock Pinto crank well balanced holds up to 8000 rpm.

    sorry about double post, the site loads very slow last 3 days, waiting for 30+ sec. to load.
    Last edited by gid; 08-09-2019 at 14:54. Reason: forum loads slow

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    Re: Pinto engine and camshaft to choose

    I will use YB stock conrods
    I am going to use the car for Fast Road application not for race, I hope that V6 stock cast pistons are going to handle the extra stress

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    Re: Pinto engine and camshaft to choose

    I will use YB stock conrods
    I am going to use the car for Fast Road application not for race, I hope that V6 stock cast pistons are going to handle the extra stress

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    Re: Pinto engine and camshaft to choose

    Cast pistons are okay but don't go mad on compession, no more than 10.8.1 in my experence and make sure your fuel and ignition is bang on.

    As a matter of interest what method are you using to secure the gudgeon pins into your YB rods?
    Last edited by Forest_rallying; 09-09-2019 at 17:06.

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    Re: Pinto engine and camshaft to choose

    Cast pistons are okay but don't go mad on compession, no more than 10.8.1 in my experence and make sure your fuel and ignition is bang on. As a matter of interest what method are you using to secure the gudgeon pins into your YB rods?
    Last edited by Forest_rallying; 09-09-2019 at 17:11.

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    Re: Pinto engine and camshaft to choose

    My mechanic has done it many times, I don't know how
    For ignition and fueling I 'll install wideband and check on dyno also .
    for max ignition timing we will do some test to see maximum advance and rpm range to be sure

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